this repo has no description
Add Firefox use-counter telemetry as fourth data source
Collect Firefox desktop and Fenix (Android) use-counter data from
Mozilla's public telemetry API, map metrics to BCD keys and web-feature
IDs, and include as supplementary data alongside Chrome-ecosystem sources.
- New collector: data/collect-firefox.mjs (streams 765MB+ Fenix files)
- 83 BWA features with Firefox data (64 CSS properties, 19 APIs)
- Firefox usage shown in report table and JSON output
- Not yet in priority waterfall — serves as cross-validation signal
+13457
+4
.gitignore
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.gitignore
+191
WEB-FEATURE-USAGE-README.md
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WEB-FEATURE-USAGE-README.md
···
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# Web Feature Usage & Prioritization Report
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A standalone, engine-agnostic dataset and report that prioritizes web platform features by real-world usage. Useful for any browser engine project deciding what to implement next.
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## Quick start
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```bash
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npm run usage-json # → data/web-feature-usage.json
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npm run usage-report # → web-feature-usage.html
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```
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## Data sources
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The report combines four data sources. The first three are used in priority order for the main usage ranking; Firefox data is included as supplementary cross-validation.
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| Publication source | What it measures | How | Denominator | Features covered |
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|---|---|---|---|---|
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| **HTTP Archive** | CSS properties, HTML elements, selectors, at-rules | Static analysis of actual page content from ~10.9M crawled pages | Fraction of crawled pages | 107 |
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| **web.dev** | Blink UseCounter data | Published by Google, queried via HTTP Archive's BigQuery mirror (`httparchive.blink_features.usage`) | Fraction of crawled pages | 46 |
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| **ChromeStatus** | Usage percentages (`day_percentage`) | Aggregated across all Chrome page loads globally (chromestatus.com) | All Chrome page loads | 230 |
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| **Firefox** | CSS property and API use-counter telemetry | Public Mozilla telemetry (desktop + Fenix/Android) | All Firefox page loads | ~82 |
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**Total:** 383 of 415 Baseline Widely Available (BWA) features have usage data from Chrome-ecosystem sources (92.3%). Firefox provides an independent signal for ~82 features.
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**Note:** web.dev and ChromeStatus both report Blink UseCounter data, but with different denominators. HTTP Archive page scanning is an independent measurement — direct content analysis, not UseCounters. Firefox use-counters provide a fully independent non-Chrome signal.
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## How Firefox use-counter data is collected
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**API endpoints (public, no auth required):**
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- Desktop: `https://public-data.telemetry.mozilla.org/api/v1/tables/firefox_desktop_derived/firefox_desktop_use_counters/v2/files`
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- Fenix (Android): `https://public-data.telemetry.mozilla.org/api/v1/tables/fenix_derived/fenix_use_counters/v2/files`
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Each endpoint returns a list of JSON file URLs (one per day). Each file contains records keyed by `(submission_date, version_major, country, metric)` with pre-computed `rate` and raw `cnt` fields.
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**Metric naming conventions:**
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- CSS: `use.counter.css.page.css_grid_template_columns` → strip prefix → strip `css_` → replace `_` with `-` → `grid-template-columns` → BCD `css.properties.grid-template-columns`
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- API: `use.counter.page.window_intersectionobserver` → strip prefix → strip `window_` → case-match to known BCD interface → `IntersectionObserver` → BCD `api.IntersectionObserver`
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**Aggregation:** Records are per-(country, version). Global rate = `sum(cnt)` / `sum(use_counter_top_level_content_documents_destroyed)` across all countries and versions.
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**Coverage:** ~682 CSS metrics and ~367 API metrics in Firefox telemetry. After mapping to web-features BCD keys, ~82 BWA features have data. CSS mapping is mechanical and reliable. API mapping requires case normalization (lowercase → PascalCase) which is lossy — some APIs don't match.
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**Limitations:**
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- Firefox-only user base (~3-4% global market share)
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- Traffic-weighted like ChromeStatus (not site-weighted like HTTP Archive)
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- No HTML element counters, no CSS selectors, no CSS at-rules
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- Fenix files are very large (~765MB uncompressed) — collected via streaming
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```bash
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node data/collect-firefox.mjs # collect latest data
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node data/collect-firefox.mjs --dry-run # show file info, no download
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node data/collect-firefox.mjs --reprocess # reprocess cached desktop data
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node data/collect-firefox.mjs --desktop-only # skip Fenix data
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```
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## How chromestatus data maps to web-features
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The mapping pipeline:
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```
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chromestatus.com/data/webfeaturepopularity
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→ [{property_name: "Flexbox", day_percentage: 0.826, ...}]
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│
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▼
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AreWeBrowserYet/servo-bcd-scripts/feature-tag.ts
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1. Converts property_name to kebab-case (e.g. "Canvas2d" → "canvas-2d")
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2. Matches against the `web-features` npm package, which defines
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canonical feature-id → BCD key mappings
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3. Attaches BCD collector results (Servo pass/fail per BCD key)
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4. Writes popularityBcdMap.json
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│
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▼ (copied into this repo)
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data/collector-results/popularityBcdMap.json
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{ "flexbox": { day_percentage: 0.826, bcd_entries: [...] },
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"avif": null, ← no chromestatus BCD association
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... }
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│
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├──▶ data/build-httparchive-mapping.mjs
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│ Maps BCD keys → HTTP Archive observable paths
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│ Generates BigQuery SQL for the HA crawl queries
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│ Writes: httparchive-mapping.json
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│ │
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│ ▼
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│ data/collect-httparchive.mjs (npm run collect → BigQuery)
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│ │
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│ ▼
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│ data/httparchive-results/combined-usage.json
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│
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└──▶ [merge step: day_percentage used as fallback]
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│
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▼
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data/build-usage-json.mjs → data/web-feature-usage.json
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data/build-usage-report.mjs → web-feature-usage.html
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data/integrate-usage.mjs → patches index.html
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Firefox use-counter pipeline (independent):
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Mozilla public telemetry API
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→ data/collect-firefox.mjs (node data/collect-firefox.mjs)
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Downloads desktop + Fenix JSON files
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Streams large files, aggregates per-metric rates
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Maps metric names → BCD keys → web-feature IDs
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│
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▼
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data/firefox-results/combined-usage.json
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│
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▼ (loaded by build-usage-json.mjs and build-usage-report.mjs)
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Included as firefox_usage field (supplementary, not in priority waterfall)
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```
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The join is **name-based**: chromestatus `property_name` → kebab-case normalization → lookup against `web-features` package IDs. When a web-feature ID exists in `web-features` but chromestatus has no BCD entries for it, the result is `null` in `popularityBcdMap.json`.
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## Mapping quality & coverage gaps
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### 32 features with no usage data from any source
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**Draft features (7)** — not yet shipped, expected gap:
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- `draft_crash-report-storage-apiinitialize`, `draft_meta-text-scale`, `draft_reference-target`, `draft_wasm-branch-hinting`, `draft_wasm-custom-descriptors`, `draft_web-app-manifest-update`, `draft_web-install-api`
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**Obsolete features (13)** — retired chromestatus groupings, expected gap:
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- `obsolete_canvas-2d`, `obsolete_canvas-alpha`, `obsolete_canvas-color-management`, `obsolete_canvas-desynchronized`, `obsolete_canvas-element`, `obsolete_canvas-fill-text`, `obsolete_canvas-measure-text`, `obsolete_canvas-text-baselines`, `obsolete_element-check-visibility`, `obsolete_hidden-until-found-attribute`, `obsolete_locale-info-obsoleted-getters`, `obsolete_popover`, `obsolete_will-read-frequently`
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**Regular features with no match (12)** — the substantive gap:
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- **`avif`**, **`webp`**, **`http3`** — high-usage features; chromestatus likely tracks these under different IDs or has no BCD associations for them
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- **`jpegxl`** — removed from Chrome; chromestatus entry may lack BCD
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- **`intersection-observer-v2`** — v1 matched; v2 may not have a distinct chromestatus entry
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- **`view-transitions-element-scoped`**, **`uint8-array-base64-hex`**, **`float16-array`** — newer features, may not have BCD associations in chromestatus yet
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- **`function`** — ambiguous name, unlikely to map to any single chromestatus feature
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- **`prompt`** — generic name; `beforeinstallprompt` matched separately
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- **`text-detect`**, **`translation-api`** — experimental/new APIs
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### Notable low-confidence entries
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- **`ric`** (requestIdleCallback) has `day_percentage: 1e-8` — suspiciously low. A separate `requestidlecallback` entry has a much higher value. Possible kebab normalization issue upstream.
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- **56 features** have `day_percentage < 0.0001` — mostly WebXR variants, WASM extensions, and hardware-access APIs (Web Bluetooth, WebHID, etc.). These are real but reflect genuinely low adoption.
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### Overall confidence
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- **92.3%** of BWA features have at least one usage signal
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- The 20 draft/obsolete gaps are expected and harmless
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- The 12 real gaps are mostly image formats and protocols (not JS APIs), which chromestatus doesn't track via BCD, plus a few very new features
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- The name-based join works well for the web-features that chromestatus does track — the `web-features` package is the canonical source for both sides
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## Normalization decisions
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- **Observable selection:** For features with multiple BCD keys / HTTP Archive observables, the highest-percentage observable is chosen as representative. This is an upper bound for feature usage.
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- **Source priority:** `custom_metrics > blink_features > chrome_popularity`. Custom metrics scan actual page content (ground truth). Blink features are Chromium use counters. Chrome popularity is aggregate across all Chrome traffic (different denominator).
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- **Specific vs generic filtering:** When multiple observables map to the same HA path, only the most specific match is kept (e.g. `css.properties.display.flex` over `css.properties.display`).
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- **Scale:** All values normalized to 0–1 in output. HA values = fraction of crawled pages. Chrome popularity = fraction of Chrome page loads. Firefox = fraction of Firefox page loads. These are not directly comparable but all reflect real-world usage.
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- **Firefox data:** Included as a supplementary `firefox_usage` field on each feature. Not yet integrated into the priority waterfall — serves as an independent cross-validation signal. For features where both Chrome and Firefox data exist, agreement strengthens confidence in the usage estimate.
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## Output format
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`data/web-feature-usage.json`:
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```json
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{
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"generated": "2026-02-21T...",
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"description": "...",
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"sources": { ... },
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"methodology": { ... },
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"summary": {
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"total_features": 415,
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"with_usage_data": 383,
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"tiers": { "above_50_pct": 26, "10_to_50_pct": 62, "1_to_10_pct": 83, "below_1_pct": 212 }
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},
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"features": [
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{
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"name": "flexbox",
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"usage": 0.951,
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"source": "custom_metrics",
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"observable": "css.properties.display.flex",
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"observable_type": "css_property",
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"bcd_key_count": 15,
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"bcd_keys": ["css.properties.flex", "css.properties.flex-basis", ...],
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"firefox_usage": 0.584,
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"firefox_observable": "css.properties.align-items"
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},
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...
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]
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}
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```
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## Regenerating
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To update the data:
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1. Get fresh `popularityBcdMap.json` from the [AreWeBrowserYet](https://github.com/AreWeBrowserYet) collector pipeline
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2. Run HTTP Archive queries: `npm run collect` (requires BigQuery credentials)
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3. Collect Firefox data: `npm run collect:firefox` (no credentials needed, downloads ~870MB)
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4. Rebuild outputs: `npm run usage-json && npm run usage-report`
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data/build-usage-json.mjs
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data/build-usage-json.mjs
···
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#!/usr/bin/env node
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/**
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* build-usage-json.mjs
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*
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* Exports the merged web feature prioritization data as a standalone JSON file.
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* Uses the same three data sources and priority logic as build-usage-report.mjs:
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* HA custom_metrics > HA blink_features > Chrome popularity
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*
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* Usage: npm run usage-json
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*/
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import { readFileSync, writeFileSync } from 'fs';
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import { join } from 'path';
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const DATA_DIR = new URL('.', import.meta.url).pathname;
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const ROOT = join(DATA_DIR, '..');
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// ── Load data sources ──────────────────────────────────────────────────
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const haData = JSON.parse(readFileSync(join(DATA_DIR, 'httparchive-results', 'combined-usage.json'), 'utf8'));
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const haFeatures = haData.features;
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const popData = JSON.parse(readFileSync(join(DATA_DIR, 'collector-results', 'popularityBcdMap.json'), 'utf8'));
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const mappingData = JSON.parse(readFileSync(join(DATA_DIR, 'httparchive-mapping.json'), 'utf8'));
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const mappingFeatures = mappingData.features;
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// Firefox use-counter data (optional — skip gracefully if not collected yet)
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let firefoxFeatures = {};
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let firefoxDate = null;
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try {
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const ffData = JSON.parse(readFileSync(join(DATA_DIR, 'firefox-results', 'combined-usage.json'), 'utf8'));
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firefoxFeatures = ffData.features;
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firefoxDate = ffData.date;
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console.log(`Firefox use-counters: ${Object.keys(firefoxFeatures).length} features (${firefoxDate})`);
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} catch {
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console.log('Firefox use-counters: not available (run: node data/collect-firefox.mjs)');
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}
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console.log(`HTTP Archive combined: ${Object.keys(haFeatures).length} features`);
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console.log(`Chrome popularity: ${Object.keys(popData).length} features`);
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console.log(`Mapping (all BWA): ${Object.keys(mappingFeatures).length} features`);
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// ── Merge with priority logic ──────────────────────────────────────────
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// Priority: HA custom_metrics > HA blink_features > Chrome popularity
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const allFeatureNames = Object.keys(mappingFeatures);
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const mergedFeatures = [];
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let countHA_custom = 0;
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let countHA_blink = 0;
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let countChrome = 0;
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let countNoData = 0;
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for (const name of allFeatureNames) {
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const mapping = mappingFeatures[name];
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const haEntry = haFeatures[name];
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const chromeEntry = popData[name];
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let usage = null;
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let source = null;
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let observable = null;
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let observableType = null;
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if (haEntry) {
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usage = haEntry.pct;
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source = haEntry.source; // "custom_metrics" or "blink_features"
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observable = haEntry.observable;
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observableType = haEntry.type;
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if (haEntry.source === 'custom_metrics') countHA_custom++;
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else countHA_blink++;
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} else if (chromeEntry && chromeEntry.day_percentage != null) {
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usage = chromeEntry.day_percentage;
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source = 'chrome_popularity';
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countChrome++;
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} else {
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countNoData++;
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}
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const bcdKeys = mapping.bcd_keys || [];
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const bcdKeyCount = bcdKeys.length;
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// Firefox data (included as additional fields, not in priority waterfall)
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const ffEntry = firefoxFeatures[name];
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const firefoxUsage = ffEntry ? ffEntry.pct : null;
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const firefoxObservable = ffEntry ? ffEntry.observable : null;
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mergedFeatures.push({
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name,
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usage,
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source,
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observable: observable || null,
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observable_type: observableType || mapping.primary_type || null,
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bcd_key_count: bcdKeyCount,
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bcd_keys: bcdKeys,
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firefox_usage: firefoxUsage,
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firefox_observable: firefoxObservable,
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});
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}
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// Sort by usage descending, no-data at the end (then alphabetical)
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mergedFeatures.sort((a, b) => {
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if (a.usage == null && b.usage == null) return a.name.localeCompare(b.name);
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if (a.usage == null) return 1;
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if (b.usage == null) return -1;
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return b.usage - a.usage;
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});
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// ── Compute summary statistics ─────────────────────────────────────────
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const withUsage = mergedFeatures.filter(f => f.usage != null);
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const withoutUsage = mergedFeatures.filter(f => f.usage == null);
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const tierOver50 = withUsage.filter(f => f.usage > 0.5);
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const tier10to50 = withUsage.filter(f => f.usage >= 0.1 && f.usage <= 0.5);
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const tier1to10 = withUsage.filter(f => f.usage >= 0.01 && f.usage < 0.1);
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const tierUnder1 = withUsage.filter(f => f.usage < 0.01);
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// ── Build output JSON ──────────────────────────────────────────────────
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const output = {
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generated: new Date().toISOString(),
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description: 'Web feature prioritization by real-world usage. Combines Chrome-ecosystem sources (HTTP Archive page scanning, web.dev Blink UseCounters, ChromeStatus) and Firefox use-counter telemetry, mapped to Baseline Widely Available (BWA) web-features.',
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sources: {
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httparchive: {
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description: 'HTTP Archive custom_metrics — static analysis of CSS properties, HTML elements, selectors, at-rules in ~10.9M crawled pages',
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internal_key: 'custom_metrics',
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feature_count: countHA_custom,
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},
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webdev: {
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description: 'web.dev — Blink UseCounter data published by Google, queried via HTTP Archive BigQuery mirror (httparchive.blink_features.usage)',
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internal_key: 'blink_features',
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feature_count: countHA_blink,
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},
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chromestatus: {
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description: 'ChromeStatus — usage percentages (day_percentage) aggregated across all Chrome page loads globally (chromestatus.com)',
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internal_key: 'chrome_popularity',
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feature_count: countChrome,
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},
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firefox: {
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description: 'Firefox use-counter telemetry — fraction of Firefox page loads triggering CSS property or API use-counters (public Mozilla telemetry)',
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internal_key: 'firefox_use_counters',
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feature_count: Object.keys(firefoxFeatures).length,
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date: firefoxDate,
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},
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},
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methodology: {
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priority: 'httparchive > webdev > chromestatus',
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priority_rationale: 'HTTP Archive page scanning is ground truth (direct content analysis). web.dev UseCounters cover JS APIs not detectable by static analysis. ChromeStatus is fallback with a different denominator (all Chrome traffic vs. crawled pages).',
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observable_selection: 'Highest-percentage observable chosen as representative per feature',
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scale: 'All usage values normalized to 0-1. HTTP Archive and web.dev = fraction of crawled pages. ChromeStatus = fraction of all Chrome page loads. Firefox = fraction of Firefox page loads. Values across sources are not directly comparable.',
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firefox_note: 'Firefox usage is included as supplementary data (firefox_usage field) but not yet integrated into the priority waterfall. It provides an independent, non-Chrome signal for cross-validation.',
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},
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summary: {
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total_features: allFeatureNames.length,
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with_usage_data: withUsage.length,
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without_usage_data: withoutUsage.length,
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tiers: {
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above_50_pct: tierOver50.length,
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'10_to_50_pct': tier10to50.length,
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'1_to_10_pct': tier1to10.length,
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below_1_pct: tierUnder1.length,
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},
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},
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features: mergedFeatures,
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};
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// ── Write output ───────────────────────────────────────────────────────
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const outPath = join(DATA_DIR, 'web-feature-usage.json');
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writeFileSync(outPath, JSON.stringify(output, null, 2));
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// ── Console summary ────────────────────────────────────────────────────
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const countFirefox = mergedFeatures.filter(f => f.firefox_usage != null).length;
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console.log(`\n=== Coverage ===`);
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console.log(`HA custom_metrics: ${countHA_custom}`);
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console.log(`HA blink_features: ${countHA_blink}`);
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console.log(`Chrome popularity only: ${countChrome}`);
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console.log(`Firefox use-counters: ${countFirefox} (supplementary)`);
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console.log(`No usage data: ${countNoData}`);
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console.log(`Total: ${allFeatureNames.length}`);
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console.log(`\nUsage tiers:`);
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console.log(` >50%: ${tierOver50.length}`);
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console.log(` 10-50%: ${tier10to50.length}`);
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console.log(` 1-10%: ${tier1to10.length}`);
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console.log(` <1%: ${tierUnder1.length}`);
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console.log(`\nGenerated ${outPath}`);
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console.log(` ${allFeatureNames.length} total features, ${withUsage.length} with usage data`);
+667
data/build-usage-report.mjs
+667
data/build-usage-report.mjs
···
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#!/usr/bin/env node
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3
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/**
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* build-usage-report.mjs
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*
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* Generates a standalone HTML report of web feature usage/prioritization.
7
+
* Merges three data sources with priority: HA custom_metrics > HA blink_features > Chrome popularity.
8
+
*
9
+
* Usage: npm run usage-report
10
+
*/
11
+
12
+
import { readFileSync, writeFileSync } from 'fs';
13
+
import { join } from 'path';
14
+
15
+
const DATA_DIR = new URL('.', import.meta.url).pathname;
16
+
const ROOT = join(DATA_DIR, '..');
17
+
18
+
// ── Load data sources ──────────────────────────────────────────────────
19
+
20
+
const haData = JSON.parse(readFileSync(join(DATA_DIR, 'httparchive-results', 'combined-usage.json'), 'utf8'));
21
+
const haFeatures = haData.features;
22
+
23
+
const popData = JSON.parse(readFileSync(join(DATA_DIR, 'collector-results', 'popularityBcdMap.json'), 'utf8'));
24
+
25
+
const mappingData = JSON.parse(readFileSync(join(DATA_DIR, 'httparchive-mapping.json'), 'utf8'));
26
+
const mappingFeatures = mappingData.features;
27
+
28
+
// Firefox use-counter data (optional)
29
+
let firefoxFeatures = {};
30
+
let firefoxDate = null;
31
+
try {
32
+
const ffData = JSON.parse(readFileSync(join(DATA_DIR, 'firefox-results', 'combined-usage.json'), 'utf8'));
33
+
firefoxFeatures = ffData.features;
34
+
firefoxDate = ffData.date;
35
+
console.log(`Firefox use-counters: ${Object.keys(firefoxFeatures).length} features (${firefoxDate})`);
36
+
} catch {
37
+
console.log('Firefox use-counters: not available');
38
+
}
39
+
40
+
console.log(`HTTP Archive combined: ${Object.keys(haFeatures).length} features`);
41
+
console.log(`Chrome popularity: ${Object.keys(popData).length} features`);
42
+
console.log(`Mapping (all BWA): ${Object.keys(mappingFeatures).length} features`);
43
+
44
+
// ── Merge with priority logic (reused from integrate-usage.mjs) ────────
45
+
// Priority: HA custom_metrics > HA blink_features > Chrome popularity
46
+
// HA data is already the best observable per feature (highest pct chosen).
47
+
// Chrome popularity uses a different denominator (all Chrome page loads vs crawled pages).
48
+
49
+
const allFeatureNames = Object.keys(mappingFeatures);
50
+
const mergedFeatures = [];
51
+
52
+
let countHA_custom = 0;
53
+
let countHA_blink = 0;
54
+
let countChrome = 0;
55
+
let countNoData = 0;
56
+
57
+
for (const name of allFeatureNames) {
58
+
const mapping = mappingFeatures[name];
59
+
const haEntry = haFeatures[name];
60
+
const chromeEntry = popData[name];
61
+
62
+
let usage = null;
63
+
let source = null;
64
+
let observable = null;
65
+
let observableType = null;
66
+
67
+
if (haEntry) {
68
+
usage = haEntry.pct;
69
+
source = haEntry.source; // "custom_metrics" or "blink_features"
70
+
observable = haEntry.observable;
71
+
observableType = haEntry.type;
72
+
if (haEntry.source === 'custom_metrics') countHA_custom++;
73
+
else countHA_blink++;
74
+
} else if (chromeEntry && chromeEntry.day_percentage != null) {
75
+
usage = chromeEntry.day_percentage;
76
+
source = 'chrome_popularity';
77
+
countChrome++;
78
+
} else {
79
+
countNoData++;
80
+
}
81
+
82
+
const bcdKeyCount = mapping.bcd_keys ? mapping.bcd_keys.length : 0;
83
+
const primaryType = mapping.primary_type || null;
84
+
85
+
const ffEntry = firefoxFeatures[name];
86
+
const firefoxUsage = ffEntry ? ffEntry.pct : null;
87
+
88
+
mergedFeatures.push({
89
+
name,
90
+
usage,
91
+
source,
92
+
observable,
93
+
observableType: observableType || primaryType,
94
+
bcdKeyCount,
95
+
popularity: mapping.popularity ?? null,
96
+
firefoxUsage,
97
+
});
98
+
}
99
+
100
+
// Sort by usage descending, no-data at the end
101
+
mergedFeatures.sort((a, b) => {
102
+
if (a.usage == null && b.usage == null) return a.name.localeCompare(b.name);
103
+
if (a.usage == null) return 1;
104
+
if (b.usage == null) return -1;
105
+
return b.usage - a.usage;
106
+
});
107
+
108
+
const countFirefox = mergedFeatures.filter(f => f.firefoxUsage != null).length;
109
+
110
+
console.log(`\n=== Coverage ===`);
111
+
console.log(`HA custom_metrics: ${countHA_custom}`);
112
+
console.log(`HA blink_features: ${countHA_blink}`);
113
+
console.log(`Chrome popularity only: ${countChrome}`);
114
+
console.log(`Firefox use-counters: ${countFirefox} (supplementary)`);
115
+
console.log(`No usage data: ${countNoData}`);
116
+
console.log(`Total: ${allFeatureNames.length}`);
117
+
118
+
// ── Compute summary statistics ─────────────────────────────────────────
119
+
120
+
const withUsage = mergedFeatures.filter(f => f.usage != null);
121
+
const withoutUsage = mergedFeatures.filter(f => f.usage == null);
122
+
123
+
const tierOver50 = withUsage.filter(f => f.usage > 0.5);
124
+
const tier10to50 = withUsage.filter(f => f.usage >= 0.1 && f.usage <= 0.5);
125
+
const tier1to10 = withUsage.filter(f => f.usage >= 0.01 && f.usage < 0.1);
126
+
const tierUnder1 = withUsage.filter(f => f.usage < 0.01);
127
+
128
+
console.log(`\nUsage tiers:`);
129
+
console.log(` >50%: ${tierOver50.length}`);
130
+
console.log(` 10-50%: ${tier10to50.length}`);
131
+
console.log(` 1-10%: ${tier1to10.length}`);
132
+
console.log(` <1%: ${tierUnder1.length}`);
133
+
134
+
// ── Build histogram buckets ────────────────────────────────────────────
135
+
136
+
const histogramBuckets = [
137
+
{ label: '0-1%', min: 0, max: 0.01 },
138
+
{ label: '1-5%', min: 0.01, max: 0.05 },
139
+
{ label: '5-10%', min: 0.05, max: 0.10 },
140
+
{ label: '10-20%', min: 0.10, max: 0.20 },
141
+
{ label: '20-30%', min: 0.20, max: 0.30 },
142
+
{ label: '30-40%', min: 0.30, max: 0.40 },
143
+
{ label: '40-50%', min: 0.40, max: 0.50 },
144
+
{ label: '50-60%', min: 0.50, max: 0.60 },
145
+
{ label: '60-70%', min: 0.60, max: 0.70 },
146
+
{ label: '70-80%', min: 0.70, max: 0.80 },
147
+
{ label: '80-90%', min: 0.80, max: 0.90 },
148
+
{ label: '90-100%', min: 0.90, max: 1.01 },
149
+
];
150
+
151
+
for (const bucket of histogramBuckets) {
152
+
bucket.count = withUsage.filter(f => f.usage >= bucket.min && f.usage < bucket.max).length;
153
+
}
154
+
155
+
// ── Top-N for bar chart ────────────────────────────────────────────────
156
+
157
+
const topN = 30;
158
+
const topFeatures = withUsage.slice(0, topN);
159
+
160
+
// ── Generate HTML ──────────────────────────────────────────────────────
161
+
162
+
const featuresJSON = JSON.stringify(mergedFeatures);
163
+
164
+
const html = `<!DOCTYPE html>
165
+
<html lang="en">
166
+
<head>
167
+
<meta charset="UTF-8">
168
+
<meta name="viewport" content="width=device-width, initial-scale=1.0">
169
+
<title>Servo BWA Feature Usage & Prioritization Report</title>
170
+
<link rel="preconnect" href="https://fonts.googleapis.com">
171
+
<link href="https://fonts.googleapis.com/css2?family=Pragati+Narrow:wght@400;700&display=swap" rel="stylesheet">
172
+
<script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.7/dist/chart.umd.min.js"><\/script>
173
+
<style>
174
+
* { margin: 0; padding: 0; box-sizing: border-box; }
175
+
body {
176
+
font-family: "Pragati Narrow", sans-serif;
177
+
background: rgb(247, 226, 231); color: #1d1d1d;
178
+
padding: 24px; font-size: 1.1rem; line-height: 1.3;
179
+
}
180
+
h1 { font-size: 28px; margin-bottom: 8px; color: rgb(71, 11, 0); }
181
+
h2 { font-size: 20px; margin-bottom: 12px; color: rgb(71, 11, 0); font-weight: 700; }
182
+
.byline { font-size: 13px; color: #1d1d1d; }
183
+
.byline a { color: rgb(71, 11, 0); }
184
+
.subtitle { color: #666; margin-bottom: 24px; font-size: 14px; }
185
+
a { color: rgb(71, 11, 0); }
186
+
187
+
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 24px; }
188
+
.card { background: #fff; border-radius: 12px; padding: 20px; border: 1px solid rgba(71, 11, 0, 0.15); }
189
+
.card.full { grid-column: 1 / -1; }
190
+
.card h3 {
191
+
font-size: 15px; color: rgb(71, 11, 0); margin-bottom: 16px;
192
+
font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
193
+
}
194
+
195
+
.metric { display: flex; gap: 32px; margin-bottom: 20px; flex-wrap: wrap; }
196
+
.metric-item { text-align: center; }
197
+
.metric-value { font-size: 36px; font-weight: 700; color: rgb(71, 11, 0); }
198
+
.metric-label { font-size: 12px; color: #666; margin-top: 4px; }
199
+
200
+
.chart-container { position: relative; height: 300px; }
201
+
.chart-container.tall { height: 500px; }
202
+
canvas { max-width: 100%; }
203
+
204
+
.notes {
205
+
background: #fff; border-radius: 12px; padding: 20px;
206
+
border: 1px solid rgba(71, 11, 0, 0.15); margin-bottom: 24px;
207
+
border-left: 3px solid rgb(71, 11, 0);
208
+
}
209
+
.notes h3 {
210
+
font-size: 15px; color: rgb(71, 11, 0); margin-bottom: 12px;
211
+
font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
212
+
}
213
+
.notes p, .notes li {
214
+
font-size: 13px; line-height: 1.6; color: #1d1d1d; margin-bottom: 8px;
215
+
}
216
+
.notes ul { margin-left: 20px; }
217
+
.notes strong { color: rgb(71, 11, 0); }
218
+
.notes code {
219
+
background: rgba(71, 11, 0, 0.06); padding: 1px 5px; border-radius: 3px;
220
+
font-family: monospace; font-size: 12px;
221
+
}
222
+
223
+
/* Table styles */
224
+
.feature-table-wrap {
225
+
max-height: 800px; overflow-y: auto; border: 1px solid rgba(71, 11, 0, 0.15);
226
+
border-radius: 8px; background: #fff;
227
+
}
228
+
table.ftable { width: 100%; border-collapse: collapse; font-size: 13px; }
229
+
table.ftable thead { position: sticky; top: 0; z-index: 1; }
230
+
table.ftable th {
231
+
text-align: left; padding: 8px 10px; background: rgba(71, 11, 0, 0.05);
232
+
border-bottom: 2px solid rgba(71, 11, 0, 0.2); color: rgb(71, 11, 0);
233
+
font-weight: 700; cursor: pointer; user-select: none; white-space: nowrap;
234
+
}
235
+
table.ftable th:hover { background: rgba(71, 11, 0, 0.1); }
236
+
table.ftable th .sort-arrow { font-size: 10px; margin-left: 4px; color: #999; }
237
+
table.ftable td {
238
+
padding: 5px 10px; border-bottom: 1px solid rgba(71, 11, 0, 0.08);
239
+
}
240
+
table.ftable tr:hover td { background: rgba(71, 11, 0, 0.03); }
241
+
242
+
.tier-high { color: #1f6e1f; font-weight: 700; }
243
+
.tier-med { color: #8a5a00; font-weight: 700; }
244
+
.tier-low { color: #666; }
245
+
.tier-vlow { color: #999; }
246
+
.tier-none { color: #ccc; font-style: italic; }
247
+
248
+
.source-tag {
249
+
display: inline-block; padding: 1px 6px; border-radius: 4px;
250
+
font-size: 11px; font-weight: 600;
251
+
}
252
+
.source-tag.custom_metrics { background: rgba(31, 110, 31, 0.12); color: #1f6e1f; }
253
+
.source-tag.blink_features { background: rgba(138, 90, 0, 0.12); color: #8a5a00; }
254
+
.source-tag.chrome_popularity { background: rgba(100, 100, 180, 0.12); color: #4a4a8a; }
255
+
.source-tag.firefox_use_counters { background: rgba(184, 110, 0, 0.12); color: #b86e00; }
256
+
.source-tag.none { background: rgba(0,0,0,0.05); color: #999; }
257
+
258
+
.filter-bar {
259
+
display: flex; gap: 12px; align-items: center; margin-bottom: 16px; flex-wrap: wrap;
260
+
}
261
+
.filter-bar input[type="text"] {
262
+
padding: 6px 12px; border: 1px solid rgba(71, 11, 0, 0.2); border-radius: 6px;
263
+
font-family: inherit; font-size: 13px; flex: 1; min-width: 200px;
264
+
}
265
+
.filter-bar select {
266
+
padding: 6px 8px; border: 1px solid rgba(71, 11, 0, 0.2); border-radius: 6px;
267
+
font-family: inherit; font-size: 13px; background: #fff;
268
+
}
269
+
.filter-bar .count { font-size: 12px; color: #666; }
270
+
271
+
@media (max-width: 900px) { .grid { grid-template-columns: 1fr; } }
272
+
273
+
.footer {
274
+
font-size: 11px; color: #686868; text-align: center; margin-top: 24px;
275
+
padding-top: 12px; border-top: 1px solid rgba(71, 11, 0, 0.15);
276
+
}
277
+
</style>
278
+
</head>
279
+
<body>
280
+
281
+
<div style="background:#a33;color:#fff;text-align:center;padding:6px;font-size:13px;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;margin-bottom:10px;">DRAFT — Do not circulate without permission</div>
282
+
283
+
<h1>Web Feature Usage & Prioritization</h1>
284
+
<div class="byline">Servo Baseline Readiness Project — <a href="https://webtransitions.org">webtransitions.org</a></div>
285
+
<p class="subtitle">Data as of ${haData.crawl_date} (HTTP Archive) — ${allFeatureNames.length} Baseline "Widely Available" features analyzed</p>
286
+
287
+
<!-- Summary metrics -->
288
+
<div class="metric">
289
+
<div class="metric-item">
290
+
<div class="metric-value">${allFeatureNames.length}</div>
291
+
<div class="metric-label">Total BWA Features</div>
292
+
</div>
293
+
<div class="metric-item">
294
+
<div class="metric-value" style="color:#1f6e1f">${withUsage.length}</div>
295
+
<div class="metric-label">With Usage Data<br>(${(withUsage.length / allFeatureNames.length * 100).toFixed(1)}%)</div>
296
+
</div>
297
+
<div class="metric-item">
298
+
<div class="metric-value" style="color:#1f6e1f">${countHA_custom}</div>
299
+
<div class="metric-label">HTTP Archive<br>(page content scanning)</div>
300
+
</div>
301
+
<div class="metric-item">
302
+
<div class="metric-value" style="color:#8a5a00">${countHA_blink}</div>
303
+
<div class="metric-label">web.dev<br>(UseCounters via HA)</div>
304
+
</div>
305
+
<div class="metric-item">
306
+
<div class="metric-value" style="color:#4a4a8a">${countChrome}</div>
307
+
<div class="metric-label">ChromeStatus<br>(UseCounters, all Chrome traffic)</div>
308
+
</div>
309
+
<div class="metric-item">
310
+
<div class="metric-value" style="color:#b86e00">${countFirefox}</div>
311
+
<div class="metric-label">Firefox<br>(use-counter telemetry)</div>
312
+
</div>
313
+
<div class="metric-item">
314
+
<div class="metric-value" style="color:#999">${countNoData}</div>
315
+
<div class="metric-label">No Usage Data</div>
316
+
</div>
317
+
</div>
318
+
319
+
<!-- Usage tier summary -->
320
+
<div class="grid">
321
+
<div class="card">
322
+
<h3>Usage Tier Distribution</h3>
323
+
<table style="width:100%;border-collapse:collapse;font-size:14px;">
324
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
325
+
<td style="padding:6px 0;"><span class="tier-high">>50%</span></td>
326
+
<td style="text-align:right;font-weight:700;">${tierOver50.length} features</td>
327
+
<td style="text-align:right;color:#666;">${(tierOver50.length / allFeatureNames.length * 100).toFixed(1)}%</td>
328
+
</tr>
329
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
330
+
<td style="padding:6px 0;"><span class="tier-med">10–50%</span></td>
331
+
<td style="text-align:right;font-weight:700;">${tier10to50.length} features</td>
332
+
<td style="text-align:right;color:#666;">${(tier10to50.length / allFeatureNames.length * 100).toFixed(1)}%</td>
333
+
</tr>
334
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
335
+
<td style="padding:6px 0;"><span class="tier-low">1–10%</span></td>
336
+
<td style="text-align:right;font-weight:700;">${tier1to10.length} features</td>
337
+
<td style="text-align:right;color:#666;">${(tier1to10.length / allFeatureNames.length * 100).toFixed(1)}%</td>
338
+
</tr>
339
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
340
+
<td style="padding:6px 0;"><span class="tier-vlow"><1%</span></td>
341
+
<td style="text-align:right;font-weight:700;">${tierUnder1.length} features</td>
342
+
<td style="text-align:right;color:#666;">${(tierUnder1.length / allFeatureNames.length * 100).toFixed(1)}%</td>
343
+
</tr>
344
+
<tr>
345
+
<td style="padding:6px 0;"><span class="tier-none">No data</span></td>
346
+
<td style="text-align:right;font-weight:700;">${withoutUsage.length} features</td>
347
+
<td style="text-align:right;color:#666;">${(withoutUsage.length / allFeatureNames.length * 100).toFixed(1)}%</td>
348
+
</tr>
349
+
</table>
350
+
</div>
351
+
352
+
<div class="card">
353
+
<h3>Data Source Coverage</h3>
354
+
<table style="width:100%;border-collapse:collapse;font-size:14px;">
355
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
356
+
<td style="padding:6px 0;"><span class="source-tag custom_metrics">HTTP Archive</span></td>
357
+
<td style="text-align:right;font-weight:700;">${countHA_custom}</td>
358
+
<td style="color:#666;">Static analysis of CSS properties, HTML elements, selectors, at-rules in ~10.9M crawled pages</td>
359
+
</tr>
360
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
361
+
<td style="padding:6px 0;"><span class="source-tag blink_features">web.dev</span></td>
362
+
<td style="text-align:right;font-weight:700;">${countHA_blink}</td>
363
+
<td style="color:#666;">Blink UseCounter data published by Google, queried via HTTP Archive’s BigQuery mirror (<code>httparchive.blink_features.usage</code>)</td>
364
+
</tr>
365
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
366
+
<td style="padding:6px 0;"><span class="source-tag chrome_popularity">ChromeStatus</span></td>
367
+
<td style="text-align:right;font-weight:700;">${countChrome}</td>
368
+
<td style="color:#666;">Usage percentages from chromestatus.com (<code>day_percentage</code>) — aggregated across all Chrome page loads globally</td>
369
+
</tr>
370
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
371
+
<td style="padding:6px 0;"><span class="source-tag firefox_use_counters">Firefox</span></td>
372
+
<td style="text-align:right;font-weight:700;">${countFirefox}</td>
373
+
<td style="color:#666;">Firefox use-counter telemetry — fraction of Firefox page loads triggering CSS/API use-counters (public Mozilla data)</td>
374
+
</tr>
375
+
<tr>
376
+
<td style="padding:6px 0;"><span class="source-tag none">none</span></td>
377
+
<td style="text-align:right;font-weight:700;">${countNoData}</td>
378
+
<td style="color:#666;">No usage signal available</td>
379
+
</tr>
380
+
</table>
381
+
<p style="font-size:12px;color:#888;margin-top:12px;line-height:1.5;">
382
+
<strong>Note:</strong> web.dev and ChromeStatus both report Blink UseCounter data, but with different denominators.
383
+
web.dev data is queried via HTTP Archive’s BigQuery tables (denominator = ~10.9M crawled pages).
384
+
ChromeStatus aggregates across all real Chrome user traffic globally (denominator = all Chrome page loads).
385
+
HTTP Archive page scanning is an independent measurement — direct content analysis, not UseCounters.
386
+
Firefox use-counters provide an independent non-Chrome signal (denominator = all Firefox page loads).
387
+
Values across sources are <em>not directly comparable</em>.
388
+
</p>
389
+
</div>
390
+
</div>
391
+
392
+
<!-- Charts -->
393
+
<div class="grid">
394
+
<div class="card">
395
+
<h3>Usage Distribution Histogram</h3>
396
+
<div class="chart-container"><canvas id="histogram"></canvas></div>
397
+
</div>
398
+
<div class="card">
399
+
<h3>Top ${topN} Features by Usage</h3>
400
+
<div style="font-size:11px;margin-bottom:8px;display:flex;gap:16px;">
401
+
<span><span style="display:inline-block;width:12px;height:12px;border-radius:2px;background:rgba(31,110,31,0.7);vertical-align:middle;margin-right:4px;"></span>HTTP Archive</span>
402
+
<span><span style="display:inline-block;width:12px;height:12px;border-radius:2px;background:rgba(138,90,0,0.7);vertical-align:middle;margin-right:4px;"></span>web.dev</span>
403
+
<span><span style="display:inline-block;width:12px;height:12px;border-radius:2px;background:rgba(74,74,138,0.7);vertical-align:middle;margin-right:4px;"></span>ChromeStatus</span>
404
+
</div>
405
+
<div class="chart-container tall"><canvas id="topChart"></canvas></div>
406
+
</div>
407
+
</div>
408
+
409
+
<!-- Normalization notes -->
410
+
<div class="notes">
411
+
<h3>Data Quality & Normalization Notes</h3>
412
+
<ul>
413
+
<li><strong>Observable selection:</strong> Each BWA feature maps to multiple BCD keys and HTTP Archive observables. The representative observable is chosen as the one with the <strong>highest usage percentage</strong> among all queryable observables for that feature. This means the reported usage is an upper bound for the feature.</li>
414
+
<li><strong>Source priority:</strong> HTTP Archive > web.dev > ChromeStatus.
415
+
<strong>HTTP Archive</strong> is preferred because it directly analyzes page content (CSS properties, selectors, at-rules, HTML elements) — ground truth for what’s on the page.
416
+
<strong>web.dev</strong> provides Blink UseCounter data published by Google and queryable via HTTP Archive’s BigQuery mirror. Covers JS API features that can’t be detected by static page analysis.
417
+
<strong>ChromeStatus</strong> provides usage percentages aggregated across all real Chrome user traffic globally (chromestatus.com <code>day_percentage</code>). This is the fallback source, with a different denominator (all Chrome page loads vs. crawled pages).</li>
418
+
<li><strong>Scale normalization:</strong> All usage values are on a 0–1 scale. HTTP Archive and web.dev values = fraction of ~10.9M crawled pages. ChromeStatus = fraction of all Chrome page loads globally. The different denominators mean values across sources are <em>not directly comparable</em>.</li>
419
+
<li><strong>Specific vs generic filtering:</strong> When multiple observables map to the same HTTP Archive path, only the most specific match is kept. For example, <code>css.properties.display.flex</code> is preferred over <code>css.properties.display</code> when measuring flexbox usage.</li>
420
+
<li><strong>ChromeStatus integration:</strong> Chrome popularity data is already integrated as a fallback. It covers features that HTTP Archive cannot directly observe (e.g., JS APIs not detectable via static analysis). The different denominator means these values are not directly comparable to HA values, but both reflect real-world usage signals.</li>
421
+
<li><strong>Firefox use-counters:</strong> ${countFirefox} features have Firefox telemetry data, shown in the “Firefox %” column. This is an independent, non-Chrome signal from public Mozilla telemetry. The denominator is all Firefox page loads (traffic-weighted, like ChromeStatus). Firefox data is supplementary — it does not affect the primary usage ranking but enables cross-browser validation.</li>
422
+
<li><strong>Coverage gap:</strong> ${countNoData} BWA features (${(countNoData / allFeatureNames.length * 100).toFixed(1)}%) have no usage data from any source. Many of these are fundamental features (e.g., core HTML elements, basic CSS) that are universally used but not tracked by use counters, or JS built-ins provided by SpiderMonkey.</li>
423
+
</ul>
424
+
</div>
425
+
426
+
<!-- Feature table -->
427
+
<div class="card full" style="grid-column:auto;">
428
+
<h3>Full Prioritized Feature Table</h3>
429
+
<div class="filter-bar">
430
+
<input type="text" id="searchBox" placeholder="Filter by feature name...">
431
+
<select id="sourceFilter">
432
+
<option value="all">All sources</option>
433
+
<option value="custom_metrics">HTTP Archive</option>
434
+
<option value="blink_features">web.dev</option>
435
+
<option value="chrome_popularity">ChromeStatus</option>
436
+
<option value="none">No data</option>
437
+
</select>
438
+
<select id="tierFilter">
439
+
<option value="all">All tiers</option>
440
+
<option value="high">>50%</option>
441
+
<option value="med">10-50%</option>
442
+
<option value="low">1-10%</option>
443
+
<option value="vlow"><1%</option>
444
+
<option value="none">No data</option>
445
+
</select>
446
+
<span class="count" id="rowCount"></span>
447
+
</div>
448
+
<div class="feature-table-wrap">
449
+
<table class="ftable" id="featureTable">
450
+
<thead>
451
+
<tr>
452
+
<th data-col="rank"># <span class="sort-arrow"></span></th>
453
+
<th data-col="name">Feature <span class="sort-arrow"></span></th>
454
+
<th data-col="usage">Usage % <span class="sort-arrow"></span></th>
455
+
<th data-col="firefox">Firefox % <span class="sort-arrow"></span></th>
456
+
<th data-col="source">Source <span class="sort-arrow"></span></th>
457
+
<th data-col="type">Observable Type <span class="sort-arrow"></span></th>
458
+
<th data-col="bcd">BCD Keys <span class="sort-arrow"></span></th>
459
+
</tr>
460
+
</thead>
461
+
<tbody id="featureBody"></tbody>
462
+
</table>
463
+
</div>
464
+
</div>
465
+
466
+
<div class="footer">
467
+
Servo Baseline Readiness — Web Feature Usage Report — Generated ${new Date().toISOString().slice(0, 10)} — <a href="https://webtransitions.org">webtransitions.org</a>
468
+
</div>
469
+
470
+
<script>
471
+
// Embedded data
472
+
const features = ${featuresJSON};
473
+
474
+
// ── Histogram chart ──────────────────────────────────────────────────
475
+
const histLabels = ${JSON.stringify(histogramBuckets.map(b => b.label))};
476
+
const histCounts = ${JSON.stringify(histogramBuckets.map(b => b.count))};
477
+
478
+
new Chart(document.getElementById('histogram'), {
479
+
type: 'bar',
480
+
data: {
481
+
labels: histLabels,
482
+
datasets: [{
483
+
label: 'Features',
484
+
data: histCounts,
485
+
backgroundColor: histLabels.map((_, i) => {
486
+
const t = i / (histLabels.length - 1);
487
+
if (t > 0.7) return 'rgba(31, 110, 31, 0.7)';
488
+
if (t > 0.3) return 'rgba(138, 90, 0, 0.7)';
489
+
return 'rgba(71, 11, 0, 0.4)';
490
+
}),
491
+
borderRadius: 4,
492
+
}]
493
+
},
494
+
options: {
495
+
responsive: true, maintainAspectRatio: false,
496
+
plugins: { legend: { display: false } },
497
+
scales: {
498
+
y: { beginAtZero: true, title: { display: true, text: 'Number of features' } },
499
+
x: { title: { display: true, text: 'Usage range' } }
500
+
}
501
+
}
502
+
});
503
+
504
+
// ── Top-N bar chart ──────────────────────────────────────────────────
505
+
const topData = ${JSON.stringify(topFeatures.map(f => ({ name: f.name, usage: f.usage, source: f.source })))};
506
+
507
+
new Chart(document.getElementById('topChart'), {
508
+
type: 'bar',
509
+
data: {
510
+
labels: topData.map(d => d.name),
511
+
datasets: [{
512
+
label: 'Usage %',
513
+
data: topData.map(d => +(d.usage * 100).toFixed(2)),
514
+
backgroundColor: topData.map(d => {
515
+
if (d.source === 'custom_metrics') return 'rgba(31, 110, 31, 0.7)';
516
+
if (d.source === 'blink_features') return 'rgba(138, 90, 0, 0.7)';
517
+
return 'rgba(74, 74, 138, 0.7)';
518
+
}),
519
+
borderRadius: 3,
520
+
}]
521
+
},
522
+
options: {
523
+
indexAxis: 'y',
524
+
responsive: true, maintainAspectRatio: false,
525
+
plugins: { legend: { display: false } },
526
+
scales: {
527
+
x: { beginAtZero: true, max: 100, title: { display: true, text: 'Usage %' } },
528
+
y: { ticks: { font: { size: 11 } } }
529
+
}
530
+
}
531
+
});
532
+
533
+
// ── Sortable, filterable table ───────────────────────────────────────
534
+
const tbody = document.getElementById('featureBody');
535
+
const searchBox = document.getElementById('searchBox');
536
+
const sourceFilter = document.getElementById('sourceFilter');
537
+
const tierFilter = document.getElementById('tierFilter');
538
+
const rowCountEl = document.getElementById('rowCount');
539
+
540
+
let sortCol = 'usage';
541
+
let sortAsc = false;
542
+
543
+
function usageTier(u) {
544
+
if (u == null) return 'none';
545
+
if (u > 0.5) return 'high';
546
+
if (u >= 0.1) return 'med';
547
+
if (u >= 0.01) return 'low';
548
+
return 'vlow';
549
+
}
550
+
551
+
function tierClass(t) {
552
+
return { high: 'tier-high', med: 'tier-med', low: 'tier-low', vlow: 'tier-vlow', none: 'tier-none' }[t] || '';
553
+
}
554
+
555
+
function fmtUsage(u) {
556
+
if (u == null) return '<span class="tier-none">--</span>';
557
+
const pct = (u * 100);
558
+
const cls = tierClass(usageTier(u));
559
+
if (pct < 0.01) return '<span class="' + cls + '">' + pct.toFixed(4) + '%</span>';
560
+
if (pct < 1) return '<span class="' + cls + '">' + pct.toFixed(3) + '%</span>';
561
+
return '<span class="' + cls + '">' + pct.toFixed(2) + '%</span>';
562
+
}
563
+
564
+
const sourceLabels = {
565
+
custom_metrics: 'HTTP Archive',
566
+
blink_features: 'web.dev',
567
+
chrome_popularity: 'ChromeStatus'
568
+
};
569
+
570
+
function sourceTag(s) {
571
+
if (!s) return '<span class="source-tag none">none</span>';
572
+
return '<span class="source-tag ' + s + '">' + (sourceLabels[s] || s) + '</span>';
573
+
}
574
+
575
+
function sortFeatures(arr) {
576
+
const dir = sortAsc ? 1 : -1;
577
+
return [...arr].sort((a, b) => {
578
+
if (sortCol === 'name') return dir * a.name.localeCompare(b.name);
579
+
if (sortCol === 'usage') {
580
+
if (a.usage == null && b.usage == null) return a.name.localeCompare(b.name);
581
+
if (a.usage == null) return 1;
582
+
if (b.usage == null) return -1;
583
+
return dir * (a.usage - b.usage);
584
+
}
585
+
if (sortCol === 'firefox') {
586
+
if (a.firefoxUsage == null && b.firefoxUsage == null) return a.name.localeCompare(b.name);
587
+
if (a.firefoxUsage == null) return 1;
588
+
if (b.firefoxUsage == null) return -1;
589
+
return dir * (a.firefoxUsage - b.firefoxUsage);
590
+
}
591
+
if (sortCol === 'source') return dir * (a.source || 'zzz').localeCompare(b.source || 'zzz');
592
+
if (sortCol === 'type') return dir * (a.observableType || 'zzz').localeCompare(b.observableType || 'zzz');
593
+
if (sortCol === 'bcd') return dir * (a.bcdKeyCount - b.bcdKeyCount);
594
+
if (sortCol === 'rank') return dir * (features.indexOf(a) - features.indexOf(b));
595
+
return 0;
596
+
});
597
+
}
598
+
599
+
function render() {
600
+
const search = searchBox.value.toLowerCase();
601
+
const srcVal = sourceFilter.value;
602
+
const tierVal = tierFilter.value;
603
+
604
+
let filtered = features.filter(f => {
605
+
if (search && !f.name.toLowerCase().includes(search)) return false;
606
+
if (srcVal !== 'all') {
607
+
if (srcVal === 'none' && f.source != null) return false;
608
+
if (srcVal !== 'none' && f.source !== srcVal) return false;
609
+
}
610
+
if (tierVal !== 'all' && usageTier(f.usage) !== tierVal) return false;
611
+
return true;
612
+
});
613
+
614
+
filtered = sortFeatures(filtered);
615
+
616
+
rowCountEl.textContent = filtered.length + ' of ' + features.length + ' features';
617
+
618
+
const rows = filtered.map((f, i) => {
619
+
return '<tr>'
620
+
+ '<td>' + (i + 1) + '</td>'
621
+
+ '<td><strong>' + f.name + '</strong>' + (f.observable ? ' <span style="color:#999;font-size:11px;">(' + f.observable + ')</span>' : '') + '</td>'
622
+
+ '<td>' + fmtUsage(f.usage) + '</td>'
623
+
+ '<td>' + fmtUsage(f.firefoxUsage) + '</td>'
624
+
+ '<td>' + sourceTag(f.source) + '</td>'
625
+
+ '<td style="color:#666;font-size:12px;">' + (f.observableType || '--') + '</td>'
626
+
+ '<td style="text-align:center;">' + f.bcdKeyCount + '</td>'
627
+
+ '</tr>';
628
+
});
629
+
630
+
tbody.innerHTML = rows.join('');
631
+
}
632
+
633
+
// Sort click handler
634
+
document.querySelectorAll('th[data-col]').forEach(th => {
635
+
th.addEventListener('click', () => {
636
+
const col = th.dataset.col;
637
+
if (sortCol === col) { sortAsc = !sortAsc; }
638
+
else { sortCol = col; sortAsc = col === 'name'; }
639
+
640
+
// Update arrows
641
+
document.querySelectorAll('th[data-col] .sort-arrow').forEach(el => el.textContent = '');
642
+
th.querySelector('.sort-arrow').textContent = sortAsc ? ' \\u25B2' : ' \\u25BC';
643
+
644
+
render();
645
+
});
646
+
});
647
+
648
+
searchBox.addEventListener('input', render);
649
+
sourceFilter.addEventListener('change', render);
650
+
tierFilter.addEventListener('change', render);
651
+
652
+
// Initial render
653
+
render();
654
+
655
+
// Set initial sort arrow
656
+
document.querySelector('th[data-col="usage"] .sort-arrow').textContent = ' \\u25BC';
657
+
<\/script>
658
+
659
+
</body>
660
+
</html>`;
661
+
662
+
// ── Write output ───────────────────────────────────────────────────────
663
+
664
+
const outPath = join(ROOT, 'web-feature-usage.html');
665
+
writeFileSync(outPath, html);
666
+
console.log(`\nGenerated ${outPath}`);
667
+
console.log(` ${allFeatureNames.length} total features, ${withUsage.length} with usage data`);
+599
data/collect-firefox.mjs
+599
data/collect-firefox.mjs
···
1
+
#!/usr/bin/env node
2
+
3
+
/**
4
+
* collect-firefox.mjs
5
+
*
6
+
* Collects Firefox use-counter telemetry from Mozilla's public data API.
7
+
* Downloads desktop and Fenix (Android) data, aggregates across countries
8
+
* and versions, maps metrics to BCD keys and web-feature IDs.
9
+
*
10
+
* No authentication required — uses public Mozilla telemetry endpoints.
11
+
*
12
+
* Usage:
13
+
* node data/collect-firefox.mjs # collect latest data
14
+
* node data/collect-firefox.mjs --dry-run # show file info, no download
15
+
* node data/collect-firefox.mjs --reprocess # reprocess cached raw data
16
+
* node data/collect-firefox.mjs --date=2025-06-11 # specific date (match file content)
17
+
* node data/collect-firefox.mjs --desktop-only # skip Fenix data
18
+
*/
19
+
20
+
import { readFileSync, writeFileSync, mkdirSync } from 'fs';
21
+
import { join, dirname } from 'path';
22
+
import { fileURLToPath } from 'url';
23
+
24
+
const __dirname = dirname(fileURLToPath(import.meta.url));
25
+
const RESULTS_DIR = join(__dirname, 'firefox-results');
26
+
27
+
const DESKTOP_FILES_URL = 'https://public-data.telemetry.mozilla.org/api/v1/tables/firefox_desktop_derived/firefox_desktop_use_counters/v2/files';
28
+
const FENIX_FILES_URL = 'https://public-data.telemetry.mozilla.org/api/v1/tables/fenix_derived/fenix_use_counters/v2/files';
29
+
30
+
// ---------------------------------------------------------------------------
31
+
// Parse CLI args
32
+
// ---------------------------------------------------------------------------
33
+
const args = process.argv.slice(2);
34
+
35
+
function hasFlag(name) {
36
+
return args.some(a => a === `--${name}`);
37
+
}
38
+
39
+
function getFlagValue(name) {
40
+
const arg = args.find(a => a.startsWith(`--${name}=`));
41
+
return arg ? arg.split('=').slice(1).join('=') : null;
42
+
}
43
+
44
+
const DRY_RUN = hasFlag('dry-run');
45
+
const REPROCESS = hasFlag('reprocess');
46
+
const DESKTOP_ONLY = hasFlag('desktop-only');
47
+
const TARGET_DATE = getFlagValue('date');
48
+
49
+
// ---------------------------------------------------------------------------
50
+
// Load mapping for BCD key → web-feature ID resolution
51
+
// ---------------------------------------------------------------------------
52
+
const mapping = JSON.parse(readFileSync(join(__dirname, 'httparchive-mapping.json'), 'utf8'));
53
+
54
+
// Build reverse maps: BCD key → [featureId, ...]
55
+
const bcdKeyToFeatureIds = new Map();
56
+
for (const [featureId, info] of Object.entries(mapping.features)) {
57
+
if (!info.bcd_keys) continue;
58
+
for (const bcdKey of info.bcd_keys) {
59
+
if (!bcdKeyToFeatureIds.has(bcdKey)) bcdKeyToFeatureIds.set(bcdKey, []);
60
+
bcdKeyToFeatureIds.get(bcdKey).push(featureId);
61
+
}
62
+
}
63
+
64
+
// Build a set of known BCD API interface names (lowercase → original case)
65
+
// from the mapping's bcd_keys that start with "api."
66
+
const bcdApiInterfaces = new Map(); // lowercase → PascalCase
67
+
for (const [, info] of Object.entries(mapping.features)) {
68
+
if (!info.bcd_keys) continue;
69
+
for (const bcdKey of info.bcd_keys) {
70
+
const parts = bcdKey.split('.');
71
+
if (parts[0] === 'api' && parts.length >= 2) {
72
+
bcdApiInterfaces.set(parts[1].toLowerCase(), parts[1]);
73
+
}
74
+
}
75
+
}
76
+
77
+
// ---------------------------------------------------------------------------
78
+
// Metric name → BCD key mapping
79
+
// ---------------------------------------------------------------------------
80
+
81
+
/**
82
+
* Map a Firefox use-counter metric name to a BCD key.
83
+
*
84
+
* CSS metrics: use.counter.css.page.css_grid_template_columns
85
+
* → strip prefix → css_grid_template_columns
86
+
* → strip css_ → grid_template_columns
87
+
* → replace _ with - → grid-template-columns
88
+
* → BCD: css.properties.grid-template-columns
89
+
*
90
+
* API metrics: use.counter.page.window_intersectionobserver
91
+
* → strip prefix → window_intersectionobserver
92
+
* → strip window_ → intersectionobserver
93
+
* → case-match to known BCD interface → IntersectionObserver
94
+
* → BCD: api.IntersectionObserver
95
+
*
96
+
* Returns { bcdKey, type } or null if unmappable.
97
+
*/
98
+
function metricToBcdKey(metric) {
99
+
// CSS page-scope metrics
100
+
if (metric.startsWith('use.counter.css.page.')) {
101
+
const raw = metric.slice('use.counter.css.page.'.length);
102
+
// Most CSS metrics have a css_ prefix, but some (SVG properties) don't
103
+
const stripped = raw.startsWith('css_') ? raw.slice(4) : raw;
104
+
const propName = stripped.replace(/_/g, '-');
105
+
return { bcdKey: `css.properties.${propName}`, type: 'css_property' };
106
+
}
107
+
108
+
// API page-scope metrics
109
+
if (metric.startsWith('use.counter.page.')) {
110
+
const raw = metric.slice('use.counter.page.'.length);
111
+
// Most API metrics have a window_ prefix
112
+
const stripped = raw.startsWith('window_') ? raw.slice(7) : raw;
113
+
114
+
// Try to match against known BCD API interface names (case-insensitive)
115
+
const lc = stripped.toLowerCase();
116
+
const pascalCase = bcdApiInterfaces.get(lc);
117
+
if (pascalCase) {
118
+
return { bcdKey: `api.${pascalCase}`, type: 'blink_api' };
119
+
}
120
+
121
+
// Try matching as a method/property on an interface: e.g., "document_execcommand"
122
+
// Split on first underscore: prefix might be an interface
123
+
const underIdx = stripped.indexOf('_');
124
+
if (underIdx > 0) {
125
+
const ifacePart = stripped.slice(0, underIdx).toLowerCase();
126
+
const pascalIface = bcdApiInterfaces.get(ifacePart);
127
+
if (pascalIface) {
128
+
return { bcdKey: `api.${pascalIface}`, type: 'blink_api' };
129
+
}
130
+
}
131
+
132
+
return null; // unmappable API metric
133
+
}
134
+
135
+
return null; // not a page-scope metric we handle
136
+
}
137
+
138
+
/**
139
+
* Resolve a BCD key to web-feature IDs.
140
+
* Returns array of feature IDs, or empty array.
141
+
*/
142
+
function bcdKeyToFeatures(bcdKey) {
143
+
// Direct lookup
144
+
const direct = bcdKeyToFeatureIds.get(bcdKey);
145
+
if (direct) return direct;
146
+
147
+
// For CSS properties, try looking up just the top-level property
148
+
// (the mapping may have sub-feature keys like css.properties.grid-template-columns.fit-content)
149
+
const parts = bcdKey.split('.');
150
+
if (parts[0] === 'css' && parts[1] === 'properties' && parts.length === 3) {
151
+
// Already at top level, no match
152
+
return [];
153
+
}
154
+
155
+
// For API keys, try just the interface
156
+
if (parts[0] === 'api' && parts.length >= 2) {
157
+
const ifaceKey = `api.${parts[1]}`;
158
+
return bcdKeyToFeatureIds.get(ifaceKey) || [];
159
+
}
160
+
161
+
return [];
162
+
}
163
+
164
+
// ---------------------------------------------------------------------------
165
+
// Fetch and parse data
166
+
// ---------------------------------------------------------------------------
167
+
168
+
async function fetchFileList(url, label) {
169
+
console.log(`[${label}] Fetching file list...`);
170
+
const resp = await fetch(url);
171
+
if (!resp.ok) throw new Error(`HTTP ${resp.status} fetching ${url}`);
172
+
const files = await resp.json();
173
+
console.log(`[${label}] ${files.length} files available`);
174
+
return files;
175
+
}
176
+
177
+
/**
178
+
* Download and parse a JSON array file.
179
+
* Always streams and aggregates on-the-fly to handle arbitrarily large files
180
+
* (Fenix data can be 765MB+ uncompressed even though content-length shows ~42MB gzipped).
181
+
*/
182
+
async function fetchAndParse(url, label) {
183
+
console.log(`[${label}] Downloading and streaming...`);
184
+
const start = Date.now();
185
+
const resp = await fetch(url);
186
+
if (!resp.ok) throw new Error(`HTTP ${resp.status} fetching ${url}`);
187
+
return streamAndAggregate(resp, label, start);
188
+
}
189
+
190
+
/**
191
+
* Stream a large JSON array response and aggregate page-scope metrics
192
+
* on-the-fly to avoid holding the entire file in memory.
193
+
*
194
+
* Uses a fast approach: the Mozilla data is a flat JSON array of simple objects
195
+
* (no nested objects), so we can split on `},{` boundaries efficiently.
196
+
*
197
+
* Returns an object with pre-aggregated metrics instead of raw records.
198
+
* The caller detects this via the `_streamed` flag.
199
+
*/
200
+
async function streamAndAggregate(resp, label, start) {
201
+
const reader = resp.body.getReader();
202
+
const decoder = new TextDecoder();
203
+
let buffer = '';
204
+
let recordCount = 0;
205
+
let bytesRead = 0;
206
+
207
+
// Aggregate directly: metric → { totalCnt, totalDenom }
208
+
const metricAgg = new Map();
209
+
let dateFound = null;
210
+
211
+
function processRecord(jsonStr) {
212
+
let record;
213
+
try {
214
+
record = JSON.parse(jsonStr);
215
+
} catch { return; }
216
+
217
+
recordCount++;
218
+
if (!dateFound) dateFound = record.submission_date;
219
+
220
+
const metric = record.metric;
221
+
if (!metric.startsWith('use.counter.css.page.') &&
222
+
!metric.startsWith('use.counter.page.')) {
223
+
return;
224
+
}
225
+
226
+
const cnt = parseInt(record.cnt, 10);
227
+
const denom = parseInt(record.use_counter_top_level_content_documents_destroyed, 10);
228
+
if (isNaN(cnt) || isNaN(denom) || denom === 0) return;
229
+
230
+
const agg = metricAgg.get(metric);
231
+
if (agg) {
232
+
agg.totalCnt += cnt;
233
+
agg.totalDenom += denom;
234
+
} else {
235
+
metricAgg.set(metric, { totalCnt: cnt, totalDenom: denom });
236
+
}
237
+
}
238
+
239
+
while (true) {
240
+
const { done, value } = await reader.read();
241
+
if (done) break;
242
+
243
+
bytesRead += value.length;
244
+
buffer += decoder.decode(value, { stream: true });
245
+
246
+
// Split on `},{` to find complete JSON objects
247
+
// The data is a flat array: [{...},{...},{...}]
248
+
// We split on `},{` and reconstruct each object with braces
249
+
let splitIdx;
250
+
while ((splitIdx = buffer.indexOf('},{')) !== -1) {
251
+
const chunk = buffer.slice(0, splitIdx + 1); // up to and including first `}`
252
+
buffer = buffer.slice(splitIdx + 2); // skip `},{`, keep from next `{` content
253
+
254
+
// Strip leading `[` or `,` from first chunk
255
+
let objStr = chunk;
256
+
if (objStr.startsWith('[')) objStr = objStr.slice(1);
257
+
258
+
// Ensure it starts with `{`
259
+
const braceIdx = objStr.indexOf('{');
260
+
if (braceIdx >= 0) {
261
+
objStr = objStr.slice(braceIdx);
262
+
processRecord(objStr);
263
+
}
264
+
}
265
+
266
+
if (recordCount % 500000 === 0 && recordCount > 0) {
267
+
const mb = (bytesRead / (1024 * 1024)).toFixed(0);
268
+
console.log(`[${label}] ...${recordCount} records processed (${mb} MB)`);
269
+
}
270
+
}
271
+
272
+
// Process the last record (ends with `}]` instead of `},{`)
273
+
if (buffer.length > 0) {
274
+
let objStr = buffer.trim();
275
+
if (objStr.startsWith('[')) objStr = objStr.slice(1);
276
+
if (objStr.endsWith(']')) objStr = objStr.slice(0, -1);
277
+
const braceIdx = objStr.indexOf('{');
278
+
if (braceIdx >= 0) {
279
+
objStr = objStr.slice(braceIdx);
280
+
if (objStr.endsWith('}')) processRecord(objStr);
281
+
}
282
+
}
283
+
284
+
const elapsed = ((Date.now() - start) / 1000).toFixed(1);
285
+
const mb = (bytesRead / (1024 * 1024)).toFixed(1);
286
+
console.log(`[${label}] Streamed ${mb} MB in ${elapsed}s, ${recordCount} records, ${metricAgg.size} page-scope metrics`);
287
+
288
+
// Compute global rate per metric (same format as aggregateRecords output)
289
+
const result = new Map();
290
+
for (const [metric, agg] of metricAgg) {
291
+
result.set(metric, {
292
+
rate: agg.totalCnt / agg.totalDenom,
293
+
cnt: agg.totalCnt,
294
+
denom: agg.totalDenom,
295
+
});
296
+
}
297
+
298
+
return {
299
+
_streamed: true,
300
+
date: dateFound,
301
+
metrics: result,
302
+
recordCount,
303
+
};
304
+
}
305
+
306
+
// ---------------------------------------------------------------------------
307
+
// Aggregate records across countries and versions
308
+
// ---------------------------------------------------------------------------
309
+
310
+
/**
311
+
* Aggregate raw records into per-metric global rates.
312
+
*
313
+
* For page-scope metrics, the rate = sum(cnt) / sum(top_level_documents).
314
+
* But we must be careful: each (country, version) combination has its own
315
+
* denominator. The pre-computed rate is per-(country, version) cell.
316
+
*
317
+
* To get a proper global rate, we sum cnt and sum the denominator.
318
+
*/
319
+
function aggregateRecords(records, targetDate) {
320
+
// Group by metric, summing cnt and denominator
321
+
const metricAgg = new Map(); // metric → { totalCnt, totalDenom }
322
+
323
+
let dateFound = null;
324
+
let recordsUsed = 0;
325
+
326
+
for (const record of records) {
327
+
// Filter to target date if specified
328
+
if (targetDate && record.submission_date !== targetDate) continue;
329
+
330
+
// Track what date we're using
331
+
if (!dateFound) dateFound = record.submission_date;
332
+
333
+
// Only process page-scope metrics (most comparable to other sources)
334
+
const metric = record.metric;
335
+
if (!metric.startsWith('use.counter.css.page.') &&
336
+
!metric.startsWith('use.counter.page.')) {
337
+
continue;
338
+
}
339
+
340
+
const cnt = parseInt(record.cnt, 10);
341
+
const denom = parseInt(record.use_counter_top_level_content_documents_destroyed, 10);
342
+
343
+
if (isNaN(cnt) || isNaN(denom) || denom === 0) continue;
344
+
345
+
recordsUsed++;
346
+
const agg = metricAgg.get(metric);
347
+
if (agg) {
348
+
agg.totalCnt += cnt;
349
+
agg.totalDenom += denom;
350
+
} else {
351
+
metricAgg.set(metric, { totalCnt: cnt, totalDenom: denom });
352
+
}
353
+
}
354
+
355
+
console.log(` Date: ${dateFound || '(none)'}, ${recordsUsed} page-scope records aggregated into ${metricAgg.size} unique metrics`);
356
+
357
+
// Compute global rate per metric
358
+
const result = new Map();
359
+
for (const [metric, agg] of metricAgg) {
360
+
result.set(metric, {
361
+
rate: agg.totalCnt / agg.totalDenom,
362
+
cnt: agg.totalCnt,
363
+
denom: agg.totalDenom,
364
+
});
365
+
}
366
+
367
+
return { metrics: result, date: dateFound };
368
+
}
369
+
370
+
// ---------------------------------------------------------------------------
371
+
// Map aggregated metrics to web-feature IDs
372
+
// ---------------------------------------------------------------------------
373
+
374
+
function mapToFeatures(metrics) {
375
+
// metric → { bcdKey, featureIds, rate, type }
376
+
const featureUsage = {}; // featureId → { pct, source, observable, type }
377
+
378
+
let mapped = 0;
379
+
let unmapped = 0;
380
+
381
+
for (const [metric, data] of metrics) {
382
+
const mapping = metricToBcdKey(metric);
383
+
if (!mapping) {
384
+
unmapped++;
385
+
continue;
386
+
}
387
+
388
+
const featureIds = bcdKeyToFeatures(mapping.bcdKey);
389
+
if (featureIds.length === 0) {
390
+
unmapped++;
391
+
continue;
392
+
}
393
+
394
+
mapped++;
395
+
for (const fid of featureIds) {
396
+
// Keep highest rate per feature
397
+
if (!featureUsage[fid] || featureUsage[fid].pct < data.rate) {
398
+
featureUsage[fid] = {
399
+
pct: data.rate,
400
+
source: 'firefox_use_counters',
401
+
observable: mapping.bcdKey,
402
+
type: mapping.type,
403
+
};
404
+
}
405
+
}
406
+
}
407
+
408
+
console.log(` Mapped ${mapped} metrics to features, ${unmapped} unmapped`);
409
+
console.log(` ${Object.keys(featureUsage).length} unique web-features with data`);
410
+
411
+
return featureUsage;
412
+
}
413
+
414
+
// ---------------------------------------------------------------------------
415
+
// Combine desktop and Fenix data
416
+
// ---------------------------------------------------------------------------
417
+
418
+
function combineDesktopAndFenix(desktop, fenix) {
419
+
const combined = {};
420
+
421
+
// Start with desktop
422
+
if (desktop) {
423
+
for (const [fid, data] of Object.entries(desktop)) {
424
+
combined[fid] = { ...data, platforms: { desktop: data.pct } };
425
+
}
426
+
}
427
+
428
+
// Merge Fenix — take the max rate across platforms
429
+
if (fenix) {
430
+
for (const [fid, data] of Object.entries(fenix)) {
431
+
if (!combined[fid]) {
432
+
combined[fid] = { ...data, platforms: { fenix: data.pct } };
433
+
} else {
434
+
combined[fid].platforms.fenix = data.pct;
435
+
if (data.pct > combined[fid].pct) {
436
+
combined[fid].pct = data.pct;
437
+
combined[fid].observable = data.observable;
438
+
combined[fid].type = data.type;
439
+
}
440
+
}
441
+
}
442
+
}
443
+
444
+
return combined;
445
+
}
446
+
447
+
// ---------------------------------------------------------------------------
448
+
// Summary output
449
+
// ---------------------------------------------------------------------------
450
+
function printSummary(combined) {
451
+
const entries = Object.entries(combined);
452
+
const total = entries.length;
453
+
454
+
if (total === 0) {
455
+
console.log('\nNo features with data.');
456
+
return;
457
+
}
458
+
459
+
const byType = {};
460
+
for (const [, data] of entries) {
461
+
byType[data.type] = (byType[data.type] || 0) + 1;
462
+
}
463
+
464
+
console.log(`\n${'='.repeat(60)}`);
465
+
console.log(`SUMMARY: ${total} features with Firefox usage data`);
466
+
console.log('='.repeat(60));
467
+
468
+
console.log('\nBreakdown by type:');
469
+
for (const [type, count] of Object.entries(byType).sort((a, b) => b[1] - a[1])) {
470
+
console.log(` ${type}: ${count}`);
471
+
}
472
+
473
+
// Top 20 by usage
474
+
const sorted = entries.sort((a, b) => b[1].pct - a[1].pct);
475
+
const top20 = sorted.slice(0, 20);
476
+
477
+
console.log('\nTop 20 features by Firefox usage:');
478
+
console.log(` ${'Feature'.padEnd(40)} ${'%'.padStart(8)} Type`);
479
+
console.log(` ${'-'.repeat(40)} ${'-'.repeat(8)} ${'-'.repeat(15)}`);
480
+
for (const [fid, data] of top20) {
481
+
const pctStr = (data.pct * 100).toFixed(2) + '%';
482
+
console.log(` ${fid.padEnd(40)} ${pctStr.padStart(8)} ${data.type}`);
483
+
}
484
+
485
+
console.log('');
486
+
}
487
+
488
+
// ---------------------------------------------------------------------------
489
+
// Main
490
+
// ---------------------------------------------------------------------------
491
+
async function main() {
492
+
console.log('Firefox use-counter data collection');
493
+
console.log(` Mode: ${REPROCESS ? 'REPROCESS' : DRY_RUN ? 'DRY RUN' : 'EXECUTE'}`);
494
+
if (TARGET_DATE) console.log(` Target date: ${TARGET_DATE}`);
495
+
if (DESKTOP_ONLY) console.log(` Desktop only (skipping Fenix)`);
496
+
console.log('');
497
+
498
+
mkdirSync(RESULTS_DIR, { recursive: true });
499
+
500
+
// Result can be either raw records (array) or pre-aggregated streamed result (object with _streamed flag)
501
+
let desktopResult = null;
502
+
let fenixResult = null;
503
+
504
+
if (REPROCESS) {
505
+
// Load cached raw data
506
+
try {
507
+
desktopResult = JSON.parse(readFileSync(join(RESULTS_DIR, 'desktop-raw.json'), 'utf8'));
508
+
console.log(`[desktop] Loaded ${desktopResult.length} records from cache`);
509
+
} catch { console.log('[desktop] No cached data found'); }
510
+
511
+
if (!DESKTOP_ONLY) {
512
+
try {
513
+
fenixResult = JSON.parse(readFileSync(join(RESULTS_DIR, 'fenix-raw.json'), 'utf8'));
514
+
console.log(`[fenix] Loaded ${fenixResult.length} records from cache`);
515
+
} catch { console.log('[fenix] No cached data found (fenix data is streamed, not cached)'); }
516
+
}
517
+
} else {
518
+
// Fetch file lists
519
+
const desktopFiles = await fetchFileList(DESKTOP_FILES_URL, 'desktop');
520
+
521
+
if (DRY_RUN) {
522
+
console.log(`\n[desktop] Latest file: ${desktopFiles[desktopFiles.length - 1]}`);
523
+
console.log(`[desktop] Would download ~108 MB`);
524
+
525
+
if (!DESKTOP_ONLY) {
526
+
const fenixFiles = await fetchFileList(FENIX_FILES_URL, 'fenix');
527
+
console.log(`[fenix] Latest file: ${fenixFiles[fenixFiles.length - 1]}`);
528
+
console.log(`[fenix] Would download ~108 MB`);
529
+
}
530
+
return;
531
+
}
532
+
533
+
// Download latest file for each platform (streamed and aggregated on-the-fly)
534
+
const latestDesktopUrl = desktopFiles[desktopFiles.length - 1];
535
+
desktopResult = await fetchAndParse(latestDesktopUrl, 'desktop');
536
+
537
+
if (!DESKTOP_ONLY) {
538
+
const fenixFiles = await fetchFileList(FENIX_FILES_URL, 'fenix');
539
+
const latestFenixUrl = fenixFiles[fenixFiles.length - 1];
540
+
fenixResult = await fetchAndParse(latestFenixUrl, 'fenix');
541
+
}
542
+
}
543
+
544
+
// Aggregate and map
545
+
// Results are either: raw records (array from --reprocess cache) or pre-aggregated (streamed)
546
+
function getAggregated(result, label) {
547
+
if (!result) return null;
548
+
if (result._streamed) {
549
+
console.log(`\n${label} (pre-aggregated during streaming)...`);
550
+
return result;
551
+
}
552
+
console.log(`\nAggregating ${label}...`);
553
+
return aggregateRecords(result, TARGET_DATE);
554
+
}
555
+
556
+
const desktopAgg = getAggregated(desktopResult, 'desktop');
557
+
const desktopFeatures = desktopAgg ? mapToFeatures(desktopAgg.metrics) : null;
558
+
559
+
const fenixAgg = getAggregated(fenixResult, 'fenix');
560
+
const fenixFeatures = fenixAgg ? mapToFeatures(fenixAgg.metrics) : null;
561
+
562
+
// Combine
563
+
console.log('\nCombining platforms...');
564
+
const combined = combineDesktopAndFenix(desktopFeatures, fenixFeatures);
565
+
566
+
// Build output in same format as httparchive-results/combined-usage.json
567
+
const date = desktopAgg?.date || fenixAgg?.date || TARGET_DATE || 'unknown';
568
+
const combinedOutput = {
569
+
date,
570
+
source: 'firefox_use_counters',
571
+
platforms: DESKTOP_ONLY ? ['desktop'] : ['desktop', 'fenix'],
572
+
features: combined,
573
+
};
574
+
575
+
const combinedPath = join(RESULTS_DIR, 'combined-usage.json');
576
+
writeFileSync(combinedPath, JSON.stringify(combinedOutput, null, 2));
577
+
console.log(`Saved combined usage (${Object.keys(combined).length} features) to ${combinedPath}`);
578
+
579
+
// Also save per-platform mapped data
580
+
if (desktopFeatures) {
581
+
writeFileSync(
582
+
join(RESULTS_DIR, 'desktop-mapped.json'),
583
+
JSON.stringify({ date, features: desktopFeatures }, null, 2)
584
+
);
585
+
}
586
+
if (fenixFeatures) {
587
+
writeFileSync(
588
+
join(RESULTS_DIR, 'fenix-mapped.json'),
589
+
JSON.stringify({ date, features: fenixFeatures }, null, 2)
590
+
);
591
+
}
592
+
593
+
printSummary(combined);
594
+
}
595
+
596
+
main().catch(err => {
597
+
console.error('Fatal error:', err.message);
598
+
process.exit(1);
599
+
});
+837
data/firefox-results/combined-usage.json
+837
data/firefox-results/combined-usage.json
···
1
+
{
2
+
"date": "2025-06-11",
3
+
"source": "firefox_use_counters",
4
+
"platforms": [
5
+
"desktop",
6
+
"fenix"
7
+
],
8
+
"features": {
9
+
"web-bluetooth": {
10
+
"pct": 0.005845832514362171,
11
+
"source": "firefox_use_counters",
12
+
"observable": "api.BluetoothRemoteGATTDescriptor",
13
+
"type": "blink_api",
14
+
"platforms": {
15
+
"desktop": 0.003978003042683833,
16
+
"fenix": 0.005845832514362171
17
+
}
18
+
},
19
+
"keyboard-lock": {
20
+
"pct": 0.0019317707845346104,
21
+
"source": "firefox_use_counters",
22
+
"observable": "api.Keyboard",
23
+
"type": "blink_api",
24
+
"platforms": {
25
+
"desktop": 0.0011261298073384914,
26
+
"fenix": 0.0019317707845346104
27
+
}
28
+
},
29
+
"logical-properties": {
30
+
"pct": 0.31312940289211894,
31
+
"source": "firefox_use_counters",
32
+
"observable": "css.properties.inset",
33
+
"type": "css_property",
34
+
"platforms": {
35
+
"desktop": 0.2898545503601178,
36
+
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+9468
data/web-feature-usage.json
+9468
data/web-feature-usage.json
···
1
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{
2
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"generated": "2026-02-25T21:55:28.104Z",
3
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"description": "Web feature prioritization by real-world usage. Combines Chrome-ecosystem sources (HTTP Archive page scanning, web.dev Blink UseCounters, ChromeStatus) and Firefox use-counter telemetry, mapped to Baseline Widely Available (BWA) web-features.",
4
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"sources": {
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},
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"description": "web.dev — Blink UseCounter data published by Google, queried via HTTP Archive BigQuery mirror (httparchive.blink_features.usage)",
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},
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"firefox": {
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"description": "Firefox use-counter telemetry — fraction of Firefox page loads triggering CSS property or API use-counters (public Mozilla telemetry)",
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}
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},
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30
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31
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32
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33
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},
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{
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+13
package.json
+13
package.json
···
1
1
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2
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5
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17
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5
18
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+497
web-feature-usage.html
+497
web-feature-usage.html
···
1
+
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2
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3
+
<head>
4
+
<meta charset="UTF-8">
5
+
<meta name="viewport" content="width=device-width, initial-scale=1.0">
6
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7
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8
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<link href="https://fonts.googleapis.com/css2?family=Pragati+Narrow:wght@400;700&display=swap" rel="stylesheet">
9
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10
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11
+
* { margin: 0; padding: 0; box-sizing: border-box; }
12
+
body {
13
+
font-family: "Pragati Narrow", sans-serif;
14
+
background: rgb(247, 226, 231); color: #1d1d1d;
15
+
padding: 24px; font-size: 1.1rem; line-height: 1.3;
16
+
}
17
+
h1 { font-size: 28px; margin-bottom: 8px; color: rgb(71, 11, 0); }
18
+
h2 { font-size: 20px; margin-bottom: 12px; color: rgb(71, 11, 0); font-weight: 700; }
19
+
.byline { font-size: 13px; color: #1d1d1d; }
20
+
.byline a { color: rgb(71, 11, 0); }
21
+
.subtitle { color: #666; margin-bottom: 24px; font-size: 14px; }
22
+
a { color: rgb(71, 11, 0); }
23
+
24
+
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 24px; }
25
+
.card { background: #fff; border-radius: 12px; padding: 20px; border: 1px solid rgba(71, 11, 0, 0.15); }
26
+
.card.full { grid-column: 1 / -1; }
27
+
.card h3 {
28
+
font-size: 15px; color: rgb(71, 11, 0); margin-bottom: 16px;
29
+
font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
30
+
}
31
+
32
+
.metric { display: flex; gap: 32px; margin-bottom: 20px; flex-wrap: wrap; }
33
+
.metric-item { text-align: center; }
34
+
.metric-value { font-size: 36px; font-weight: 700; color: rgb(71, 11, 0); }
35
+
.metric-label { font-size: 12px; color: #666; margin-top: 4px; }
36
+
37
+
.chart-container { position: relative; height: 300px; }
38
+
.chart-container.tall { height: 500px; }
39
+
canvas { max-width: 100%; }
40
+
41
+
.notes {
42
+
background: #fff; border-radius: 12px; padding: 20px;
43
+
border: 1px solid rgba(71, 11, 0, 0.15); margin-bottom: 24px;
44
+
border-left: 3px solid rgb(71, 11, 0);
45
+
}
46
+
.notes h3 {
47
+
font-size: 15px; color: rgb(71, 11, 0); margin-bottom: 12px;
48
+
font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
49
+
}
50
+
.notes p, .notes li {
51
+
font-size: 13px; line-height: 1.6; color: #1d1d1d; margin-bottom: 8px;
52
+
}
53
+
.notes ul { margin-left: 20px; }
54
+
.notes strong { color: rgb(71, 11, 0); }
55
+
.notes code {
56
+
background: rgba(71, 11, 0, 0.06); padding: 1px 5px; border-radius: 3px;
57
+
font-family: monospace; font-size: 12px;
58
+
}
59
+
60
+
/* Table styles */
61
+
.feature-table-wrap {
62
+
max-height: 800px; overflow-y: auto; border: 1px solid rgba(71, 11, 0, 0.15);
63
+
border-radius: 8px; background: #fff;
64
+
}
65
+
table.ftable { width: 100%; border-collapse: collapse; font-size: 13px; }
66
+
table.ftable thead { position: sticky; top: 0; z-index: 1; }
67
+
table.ftable th {
68
+
text-align: left; padding: 8px 10px; background: rgba(71, 11, 0, 0.05);
69
+
border-bottom: 2px solid rgba(71, 11, 0, 0.2); color: rgb(71, 11, 0);
70
+
font-weight: 700; cursor: pointer; user-select: none; white-space: nowrap;
71
+
}
72
+
table.ftable th:hover { background: rgba(71, 11, 0, 0.1); }
73
+
table.ftable th .sort-arrow { font-size: 10px; margin-left: 4px; color: #999; }
74
+
table.ftable td {
75
+
padding: 5px 10px; border-bottom: 1px solid rgba(71, 11, 0, 0.08);
76
+
}
77
+
table.ftable tr:hover td { background: rgba(71, 11, 0, 0.03); }
78
+
79
+
.tier-high { color: #1f6e1f; font-weight: 700; }
80
+
.tier-med { color: #8a5a00; font-weight: 700; }
81
+
.tier-low { color: #666; }
82
+
.tier-vlow { color: #999; }
83
+
.tier-none { color: #ccc; font-style: italic; }
84
+
85
+
.source-tag {
86
+
display: inline-block; padding: 1px 6px; border-radius: 4px;
87
+
font-size: 11px; font-weight: 600;
88
+
}
89
+
.source-tag.custom_metrics { background: rgba(31, 110, 31, 0.12); color: #1f6e1f; }
90
+
.source-tag.blink_features { background: rgba(138, 90, 0, 0.12); color: #8a5a00; }
91
+
.source-tag.chrome_popularity { background: rgba(100, 100, 180, 0.12); color: #4a4a8a; }
92
+
.source-tag.firefox_use_counters { background: rgba(184, 110, 0, 0.12); color: #b86e00; }
93
+
.source-tag.none { background: rgba(0,0,0,0.05); color: #999; }
94
+
95
+
.filter-bar {
96
+
display: flex; gap: 12px; align-items: center; margin-bottom: 16px; flex-wrap: wrap;
97
+
}
98
+
.filter-bar input[type="text"] {
99
+
padding: 6px 12px; border: 1px solid rgba(71, 11, 0, 0.2); border-radius: 6px;
100
+
font-family: inherit; font-size: 13px; flex: 1; min-width: 200px;
101
+
}
102
+
.filter-bar select {
103
+
padding: 6px 8px; border: 1px solid rgba(71, 11, 0, 0.2); border-radius: 6px;
104
+
font-family: inherit; font-size: 13px; background: #fff;
105
+
}
106
+
.filter-bar .count { font-size: 12px; color: #666; }
107
+
108
+
@media (max-width: 900px) { .grid { grid-template-columns: 1fr; } }
109
+
110
+
.footer {
111
+
font-size: 11px; color: #686868; text-align: center; margin-top: 24px;
112
+
padding-top: 12px; border-top: 1px solid rgba(71, 11, 0, 0.15);
113
+
}
114
+
</style>
115
+
</head>
116
+
<body>
117
+
118
+
<div style="background:#a33;color:#fff;text-align:center;padding:6px;font-size:13px;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;margin-bottom:10px;">DRAFT — Do not circulate without permission</div>
119
+
120
+
<h1>Web Feature Usage & Prioritization</h1>
121
+
<div class="byline">Servo Baseline Readiness Project — <a href="https://webtransitions.org">webtransitions.org</a></div>
122
+
<p class="subtitle">Data as of 2026-02-01 (HTTP Archive) — 415 Baseline "Widely Available" features analyzed</p>
123
+
124
+
<!-- Summary metrics -->
125
+
<div class="metric">
126
+
<div class="metric-item">
127
+
<div class="metric-value">415</div>
128
+
<div class="metric-label">Total BWA Features</div>
129
+
</div>
130
+
<div class="metric-item">
131
+
<div class="metric-value" style="color:#1f6e1f">383</div>
132
+
<div class="metric-label">With Usage Data<br>(92.3%)</div>
133
+
</div>
134
+
<div class="metric-item">
135
+
<div class="metric-value" style="color:#1f6e1f">107</div>
136
+
<div class="metric-label">HTTP Archive<br>(page content scanning)</div>
137
+
</div>
138
+
<div class="metric-item">
139
+
<div class="metric-value" style="color:#8a5a00">46</div>
140
+
<div class="metric-label">web.dev<br>(UseCounters via HA)</div>
141
+
</div>
142
+
<div class="metric-item">
143
+
<div class="metric-value" style="color:#4a4a8a">230</div>
144
+
<div class="metric-label">ChromeStatus<br>(UseCounters, all Chrome traffic)</div>
145
+
</div>
146
+
<div class="metric-item">
147
+
<div class="metric-value" style="color:#b86e00">83</div>
148
+
<div class="metric-label">Firefox<br>(use-counter telemetry)</div>
149
+
</div>
150
+
<div class="metric-item">
151
+
<div class="metric-value" style="color:#999">32</div>
152
+
<div class="metric-label">No Usage Data</div>
153
+
</div>
154
+
</div>
155
+
156
+
<!-- Usage tier summary -->
157
+
<div class="grid">
158
+
<div class="card">
159
+
<h3>Usage Tier Distribution</h3>
160
+
<table style="width:100%;border-collapse:collapse;font-size:14px;">
161
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
162
+
<td style="padding:6px 0;"><span class="tier-high">>50%</span></td>
163
+
<td style="text-align:right;font-weight:700;">26 features</td>
164
+
<td style="text-align:right;color:#666;">6.3%</td>
165
+
</tr>
166
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
167
+
<td style="padding:6px 0;"><span class="tier-med">10–50%</span></td>
168
+
<td style="text-align:right;font-weight:700;">62 features</td>
169
+
<td style="text-align:right;color:#666;">14.9%</td>
170
+
</tr>
171
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
172
+
<td style="padding:6px 0;"><span class="tier-low">1–10%</span></td>
173
+
<td style="text-align:right;font-weight:700;">83 features</td>
174
+
<td style="text-align:right;color:#666;">20.0%</td>
175
+
</tr>
176
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
177
+
<td style="padding:6px 0;"><span class="tier-vlow"><1%</span></td>
178
+
<td style="text-align:right;font-weight:700;">212 features</td>
179
+
<td style="text-align:right;color:#666;">51.1%</td>
180
+
</tr>
181
+
<tr>
182
+
<td style="padding:6px 0;"><span class="tier-none">No data</span></td>
183
+
<td style="text-align:right;font-weight:700;">32 features</td>
184
+
<td style="text-align:right;color:#666;">7.7%</td>
185
+
</tr>
186
+
</table>
187
+
</div>
188
+
189
+
<div class="card">
190
+
<h3>Data Source Coverage</h3>
191
+
<table style="width:100%;border-collapse:collapse;font-size:14px;">
192
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
193
+
<td style="padding:6px 0;"><span class="source-tag custom_metrics">HTTP Archive</span></td>
194
+
<td style="text-align:right;font-weight:700;">107</td>
195
+
<td style="color:#666;">Static analysis of CSS properties, HTML elements, selectors, at-rules in ~10.9M crawled pages</td>
196
+
</tr>
197
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
198
+
<td style="padding:6px 0;"><span class="source-tag blink_features">web.dev</span></td>
199
+
<td style="text-align:right;font-weight:700;">46</td>
200
+
<td style="color:#666;">Blink UseCounter data published by Google, queried via HTTP Archive’s BigQuery mirror (<code>httparchive.blink_features.usage</code>)</td>
201
+
</tr>
202
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
203
+
<td style="padding:6px 0;"><span class="source-tag chrome_popularity">ChromeStatus</span></td>
204
+
<td style="text-align:right;font-weight:700;">230</td>
205
+
<td style="color:#666;">Usage percentages from chromestatus.com (<code>day_percentage</code>) — aggregated across all Chrome page loads globally</td>
206
+
</tr>
207
+
<tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
208
+
<td style="padding:6px 0;"><span class="source-tag firefox_use_counters">Firefox</span></td>
209
+
<td style="text-align:right;font-weight:700;">83</td>
210
+
<td style="color:#666;">Firefox use-counter telemetry — fraction of Firefox page loads triggering CSS/API use-counters (public Mozilla data)</td>
211
+
</tr>
212
+
<tr>
213
+
<td style="padding:6px 0;"><span class="source-tag none">none</span></td>
214
+
<td style="text-align:right;font-weight:700;">32</td>
215
+
<td style="color:#666;">No usage signal available</td>
216
+
</tr>
217
+
</table>
218
+
<p style="font-size:12px;color:#888;margin-top:12px;line-height:1.5;">
219
+
<strong>Note:</strong> web.dev and ChromeStatus both report Blink UseCounter data, but with different denominators.
220
+
web.dev data is queried via HTTP Archive’s BigQuery tables (denominator = ~10.9M crawled pages).
221
+
ChromeStatus aggregates across all real Chrome user traffic globally (denominator = all Chrome page loads).
222
+
HTTP Archive page scanning is an independent measurement — direct content analysis, not UseCounters.
223
+
Firefox use-counters provide an independent non-Chrome signal (denominator = all Firefox page loads).
224
+
Values across sources are <em>not directly comparable</em>.
225
+
</p>
226
+
</div>
227
+
</div>
228
+
229
+
<!-- Charts -->
230
+
<div class="grid">
231
+
<div class="card">
232
+
<h3>Usage Distribution Histogram</h3>
233
+
<div class="chart-container"><canvas id="histogram"></canvas></div>
234
+
</div>
235
+
<div class="card">
236
+
<h3>Top 30 Features by Usage</h3>
237
+
<div style="font-size:11px;margin-bottom:8px;display:flex;gap:16px;">
238
+
<span><span style="display:inline-block;width:12px;height:12px;border-radius:2px;background:rgba(31,110,31,0.7);vertical-align:middle;margin-right:4px;"></span>HTTP Archive</span>
239
+
<span><span style="display:inline-block;width:12px;height:12px;border-radius:2px;background:rgba(138,90,0,0.7);vertical-align:middle;margin-right:4px;"></span>web.dev</span>
240
+
<span><span style="display:inline-block;width:12px;height:12px;border-radius:2px;background:rgba(74,74,138,0.7);vertical-align:middle;margin-right:4px;"></span>ChromeStatus</span>
241
+
</div>
242
+
<div class="chart-container tall"><canvas id="topChart"></canvas></div>
243
+
</div>
244
+
</div>
245
+
246
+
<!-- Normalization notes -->
247
+
<div class="notes">
248
+
<h3>Data Quality & Normalization Notes</h3>
249
+
<ul>
250
+
<li><strong>Observable selection:</strong> Each BWA feature maps to multiple BCD keys and HTTP Archive observables. The representative observable is chosen as the one with the <strong>highest usage percentage</strong> among all queryable observables for that feature. This means the reported usage is an upper bound for the feature.</li>
251
+
<li><strong>Source priority:</strong> HTTP Archive > web.dev > ChromeStatus.
252
+
<strong>HTTP Archive</strong> is preferred because it directly analyzes page content (CSS properties, selectors, at-rules, HTML elements) — ground truth for what’s on the page.
253
+
<strong>web.dev</strong> provides Blink UseCounter data published by Google and queryable via HTTP Archive’s BigQuery mirror. Covers JS API features that can’t be detected by static page analysis.
254
+
<strong>ChromeStatus</strong> provides usage percentages aggregated across all real Chrome user traffic globally (chromestatus.com <code>day_percentage</code>). This is the fallback source, with a different denominator (all Chrome page loads vs. crawled pages).</li>
255
+
<li><strong>Scale normalization:</strong> All usage values are on a 0–1 scale. HTTP Archive and web.dev values = fraction of ~10.9M crawled pages. ChromeStatus = fraction of all Chrome page loads globally. The different denominators mean values across sources are <em>not directly comparable</em>.</li>
256
+
<li><strong>Specific vs generic filtering:</strong> When multiple observables map to the same HTTP Archive path, only the most specific match is kept. For example, <code>css.properties.display.flex</code> is preferred over <code>css.properties.display</code> when measuring flexbox usage.</li>
257
+
<li><strong>ChromeStatus integration:</strong> Chrome popularity data is already integrated as a fallback. It covers features that HTTP Archive cannot directly observe (e.g., JS APIs not detectable via static analysis). The different denominator means these values are not directly comparable to HA values, but both reflect real-world usage signals.</li>
258
+
<li><strong>Firefox use-counters:</strong> 83 features have Firefox telemetry data, shown in the “Firefox %” column. This is an independent, non-Chrome signal from public Mozilla telemetry. The denominator is all Firefox page loads (traffic-weighted, like ChromeStatus). Firefox data is supplementary — it does not affect the primary usage ranking but enables cross-browser validation.</li>
259
+
<li><strong>Coverage gap:</strong> 32 BWA features (7.7%) have no usage data from any source. Many of these are fundamental features (e.g., core HTML elements, basic CSS) that are universally used but not tracked by use counters, or JS built-ins provided by SpiderMonkey.</li>
260
+
</ul>
261
+
</div>
262
+
263
+
<!-- Feature table -->
264
+
<div class="card full" style="grid-column:auto;">
265
+
<h3>Full Prioritized Feature Table</h3>
266
+
<div class="filter-bar">
267
+
<input type="text" id="searchBox" placeholder="Filter by feature name...">
268
+
<select id="sourceFilter">
269
+
<option value="all">All sources</option>
270
+
<option value="custom_metrics">HTTP Archive</option>
271
+
<option value="blink_features">web.dev</option>
272
+
<option value="chrome_popularity">ChromeStatus</option>
273
+
<option value="none">No data</option>
274
+
</select>
275
+
<select id="tierFilter">
276
+
<option value="all">All tiers</option>
277
+
<option value="high">>50%</option>
278
+
<option value="med">10-50%</option>
279
+
<option value="low">1-10%</option>
280
+
<option value="vlow"><1%</option>
281
+
<option value="none">No data</option>
282
+
</select>
283
+
<span class="count" id="rowCount"></span>
284
+
</div>
285
+
<div class="feature-table-wrap">
286
+
<table class="ftable" id="featureTable">
287
+
<thead>
288
+
<tr>
289
+
<th data-col="rank"># <span class="sort-arrow"></span></th>
290
+
<th data-col="name">Feature <span class="sort-arrow"></span></th>
291
+
<th data-col="usage">Usage % <span class="sort-arrow"></span></th>
292
+
<th data-col="firefox">Firefox % <span class="sort-arrow"></span></th>
293
+
<th data-col="source">Source <span class="sort-arrow"></span></th>
294
+
<th data-col="type">Observable Type <span class="sort-arrow"></span></th>
295
+
<th data-col="bcd">BCD Keys <span class="sort-arrow"></span></th>
296
+
</tr>
297
+
</thead>
298
+
<tbody id="featureBody"></tbody>
299
+
</table>
300
+
</div>
301
+
</div>
302
+
303
+
<div class="footer">
304
+
Servo Baseline Readiness — Web Feature Usage Report — Generated 2026-02-25 — <a href="https://webtransitions.org">webtransitions.org</a>
305
+
</div>
306
+
307
+
<script>
308
+
// Embedded data
309
+
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l,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"draft_reference-target","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"draft_wasm-branch-hinting","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"draft_wasm-custom-descriptors","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"draft_web-app-manifest-update","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"draft_web-install-api","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"float16-array","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"function","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"http3","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"intersection-observer-v2","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"jpegxl","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_canvas-2d","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_canvas-alpha","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_canvas-color-management","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_canvas-desynchronized","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_canvas-element","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_canvas-fill-text","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_canvas-measure-text","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_canvas-text-baselines","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_element-check-visibility","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_hidden-until-found-attribute","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_locale-info-obsoleted-getters","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_popover","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"obsolete_will-read-frequently","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"prompt","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"text-detect","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"translation-api","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"uint8-array-base64-hex","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"view-transitions-element-scoped","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null},{"name":"webp","usage":null,"source":null,"observable":null,"observableType":null,"bcdKeyCount":0,"popularity":null,"firefoxUsage":null}];
310
+
311
+
// ── Histogram chart ──────────────────────────────────────────────────
312
+
const histLabels = ["0-1%","1-5%","5-10%","10-20%","20-30%","30-40%","40-50%","50-60%","60-70%","70-80%","80-90%","90-100%"];
313
+
const histCounts = [212,56,27,23,16,14,9,14,3,3,4,2];
314
+
315
+
new Chart(document.getElementById('histogram'), {
316
+
type: 'bar',
317
+
data: {
318
+
labels: histLabels,
319
+
datasets: [{
320
+
label: 'Features',
321
+
data: histCounts,
322
+
backgroundColor: histLabels.map((_, i) => {
323
+
const t = i / (histLabels.length - 1);
324
+
if (t > 0.7) return 'rgba(31, 110, 31, 0.7)';
325
+
if (t > 0.3) return 'rgba(138, 90, 0, 0.7)';
326
+
return 'rgba(71, 11, 0, 0.4)';
327
+
}),
328
+
borderRadius: 4,
329
+
}]
330
+
},
331
+
options: {
332
+
responsive: true, maintainAspectRatio: false,
333
+
plugins: { legend: { display: false } },
334
+
scales: {
335
+
y: { beginAtZero: true, title: { display: true, text: 'Number of features' } },
336
+
x: { title: { display: true, text: 'Usage range' } }
337
+
}
338
+
}
339
+
});
340
+
341
+
// ── Top-N bar chart ──────────────────────────────────────────────────
342
+
const topData = [{"name":"overflow-shorthand","usage":0.9575161742804598,"source":"custom_metrics"},{"name":"outline","usage":0.9238862061213736,"source":"custom_metrics"},{"name":"not","usage":0.8798817078194864,"source":"custom_metrics"},{"name":"flexbox","usage":0.877012225315162,"source":"custom_metrics"},{"name":"slot","usage":0.8186960228291648,"source":"blink_features"},{"name":"slot-assign","usage":0.8186960228291648,"source":"blink_features"},{"name":"ua-client-hints","usage":0.74314817,"source":"chrome_popularity"},{"name":"intersection-observer","usage":0.7126436781609196,"source":"blink_features"},{"name":"text-indent","usage":0.700350456135601,"source":"custom_metrics"},{"name":"grid","usage":0.6608178847582399,"source":"custom_metrics"},{"name":"appearance","usage":0.6496636388713634,"source":"custom_metrics"},{"name":"request-animation-frame","usage":0.61653786,"source":"chrome_popularity"},{"name":"beforeunload","usage":0.57920782,"source":"chrome_popularity"},{"name":"flexbox-gap","usage":0.559277,"source":"chrome_popularity"},{"name":"canvas","usage":0.535303776683087,"source":"blink_features"},{"name":"canvas-2d","usage":0.535303776683087,"source":"blink_features"},{"name":"canvas-2d-alpha","usage":0.535303776683087,"source":"blink_features"},{"name":"offscreen-canvas","usage":0.535303776683087,"source":"blink_features"},{"name":"canvas-2d-willreadfrequently","usage":0.535303776683087,"source":"blink_features"},{"name":"webgpu","usage":0.535303776683087,"source":"blink_features"},{"name":"canvas-2d-desynchronized","usage":0.535303776683087,"source":"blink_features"},{"name":"webgl2-desynchronized","usage":0.535303776683087,"source":"blink_features"},{"name":"webgl-desynchronized","usage":0.535303776683087,"source":"blink_features"},{"name":"canvas-context-lost","usage":0.535303776683087,"source":"blink_features"},{"name":"canvas-2d-color-management","usage":0.535303776683087,"source":"blink_features"},{"name":"focus-visible","usage":0.5063683718253383,"source":"custom_metrics"},{"name":"remote-playback","usage":0.4729064039408867,"source":"blink_features"},{"name":"preserves-pitch","usage":0.4729064039408867,"source":"blink_features"},{"name":"aborting","usage":0.47132189,"source":"chrome_popularity"},{"name":"clip-path","usage":0.458419918523108,"source":"custom_metrics"}];
343
+
344
+
new Chart(document.getElementById('topChart'), {
345
+
type: 'bar',
346
+
data: {
347
+
labels: topData.map(d => d.name),
348
+
datasets: [{
349
+
label: 'Usage %',
350
+
data: topData.map(d => +(d.usage * 100).toFixed(2)),
351
+
backgroundColor: topData.map(d => {
352
+
if (d.source === 'custom_metrics') return 'rgba(31, 110, 31, 0.7)';
353
+
if (d.source === 'blink_features') return 'rgba(138, 90, 0, 0.7)';
354
+
return 'rgba(74, 74, 138, 0.7)';
355
+
}),
356
+
borderRadius: 3,
357
+
}]
358
+
},
359
+
options: {
360
+
indexAxis: 'y',
361
+
responsive: true, maintainAspectRatio: false,
362
+
plugins: { legend: { display: false } },
363
+
scales: {
364
+
x: { beginAtZero: true, max: 100, title: { display: true, text: 'Usage %' } },
365
+
y: { ticks: { font: { size: 11 } } }
366
+
}
367
+
}
368
+
});
369
+
370
+
// ── Sortable, filterable table ───────────────────────────────────────
371
+
const tbody = document.getElementById('featureBody');
372
+
const searchBox = document.getElementById('searchBox');
373
+
const sourceFilter = document.getElementById('sourceFilter');
374
+
const tierFilter = document.getElementById('tierFilter');
375
+
const rowCountEl = document.getElementById('rowCount');
376
+
377
+
let sortCol = 'usage';
378
+
let sortAsc = false;
379
+
380
+
function usageTier(u) {
381
+
if (u == null) return 'none';
382
+
if (u > 0.5) return 'high';
383
+
if (u >= 0.1) return 'med';
384
+
if (u >= 0.01) return 'low';
385
+
return 'vlow';
386
+
}
387
+
388
+
function tierClass(t) {
389
+
return { high: 'tier-high', med: 'tier-med', low: 'tier-low', vlow: 'tier-vlow', none: 'tier-none' }[t] || '';
390
+
}
391
+
392
+
function fmtUsage(u) {
393
+
if (u == null) return '<span class="tier-none">--</span>';
394
+
const pct = (u * 100);
395
+
const cls = tierClass(usageTier(u));
396
+
if (pct < 0.01) return '<span class="' + cls + '">' + pct.toFixed(4) + '%</span>';
397
+
if (pct < 1) return '<span class="' + cls + '">' + pct.toFixed(3) + '%</span>';
398
+
return '<span class="' + cls + '">' + pct.toFixed(2) + '%</span>';
399
+
}
400
+
401
+
const sourceLabels = {
402
+
custom_metrics: 'HTTP Archive',
403
+
blink_features: 'web.dev',
404
+
chrome_popularity: 'ChromeStatus'
405
+
};
406
+
407
+
function sourceTag(s) {
408
+
if (!s) return '<span class="source-tag none">none</span>';
409
+
return '<span class="source-tag ' + s + '">' + (sourceLabels[s] || s) + '</span>';
410
+
}
411
+
412
+
function sortFeatures(arr) {
413
+
const dir = sortAsc ? 1 : -1;
414
+
return [...arr].sort((a, b) => {
415
+
if (sortCol === 'name') return dir * a.name.localeCompare(b.name);
416
+
if (sortCol === 'usage') {
417
+
if (a.usage == null && b.usage == null) return a.name.localeCompare(b.name);
418
+
if (a.usage == null) return 1;
419
+
if (b.usage == null) return -1;
420
+
return dir * (a.usage - b.usage);
421
+
}
422
+
if (sortCol === 'firefox') {
423
+
if (a.firefoxUsage == null && b.firefoxUsage == null) return a.name.localeCompare(b.name);
424
+
if (a.firefoxUsage == null) return 1;
425
+
if (b.firefoxUsage == null) return -1;
426
+
return dir * (a.firefoxUsage - b.firefoxUsage);
427
+
}
428
+
if (sortCol === 'source') return dir * (a.source || 'zzz').localeCompare(b.source || 'zzz');
429
+
if (sortCol === 'type') return dir * (a.observableType || 'zzz').localeCompare(b.observableType || 'zzz');
430
+
if (sortCol === 'bcd') return dir * (a.bcdKeyCount - b.bcdKeyCount);
431
+
if (sortCol === 'rank') return dir * (features.indexOf(a) - features.indexOf(b));
432
+
return 0;
433
+
});
434
+
}
435
+
436
+
function render() {
437
+
const search = searchBox.value.toLowerCase();
438
+
const srcVal = sourceFilter.value;
439
+
const tierVal = tierFilter.value;
440
+
441
+
let filtered = features.filter(f => {
442
+
if (search && !f.name.toLowerCase().includes(search)) return false;
443
+
if (srcVal !== 'all') {
444
+
if (srcVal === 'none' && f.source != null) return false;
445
+
if (srcVal !== 'none' && f.source !== srcVal) return false;
446
+
}
447
+
if (tierVal !== 'all' && usageTier(f.usage) !== tierVal) return false;
448
+
return true;
449
+
});
450
+
451
+
filtered = sortFeatures(filtered);
452
+
453
+
rowCountEl.textContent = filtered.length + ' of ' + features.length + ' features';
454
+
455
+
const rows = filtered.map((f, i) => {
456
+
return '<tr>'
457
+
+ '<td>' + (i + 1) + '</td>'
458
+
+ '<td><strong>' + f.name + '</strong>' + (f.observable ? ' <span style="color:#999;font-size:11px;">(' + f.observable + ')</span>' : '') + '</td>'
459
+
+ '<td>' + fmtUsage(f.usage) + '</td>'
460
+
+ '<td>' + fmtUsage(f.firefoxUsage) + '</td>'
461
+
+ '<td>' + sourceTag(f.source) + '</td>'
462
+
+ '<td style="color:#666;font-size:12px;">' + (f.observableType || '--') + '</td>'
463
+
+ '<td style="text-align:center;">' + f.bcdKeyCount + '</td>'
464
+
+ '</tr>';
465
+
});
466
+
467
+
tbody.innerHTML = rows.join('');
468
+
}
469
+
470
+
// Sort click handler
471
+
document.querySelectorAll('th[data-col]').forEach(th => {
472
+
th.addEventListener('click', () => {
473
+
const col = th.dataset.col;
474
+
if (sortCol === col) { sortAsc = !sortAsc; }
475
+
else { sortCol = col; sortAsc = col === 'name'; }
476
+
477
+
// Update arrows
478
+
document.querySelectorAll('th[data-col] .sort-arrow').forEach(el => el.textContent = '');
479
+
th.querySelector('.sort-arrow').textContent = sortAsc ? ' \u25B2' : ' \u25BC';
480
+
481
+
render();
482
+
});
483
+
});
484
+
485
+
searchBox.addEventListener('input', render);
486
+
sourceFilter.addEventListener('change', render);
487
+
tierFilter.addEventListener('change', render);
488
+
489
+
// Initial render
490
+
render();
491
+
492
+
// Set initial sort arrow
493
+
document.querySelector('th[data-col="usage"] .sort-arrow').textContent = ' \u25BC';
494
+
</script>
495
+
496
+
</body>
497
+
</html>