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80 /* Table styles */
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100
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106
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115
116 .flag-tag {
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121
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128 .agreement-tag.strongly_diverge { background: rgba(180, 40, 40, 0.12); color: #b42828; }
129
130 .filter-bar {
131 display: flex; gap: 12px; align-items: center; margin-bottom: 16px; flex-wrap: wrap;
132 }
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144
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146
147 .footer {
148 font-size: 11px; color: #686868; text-align: center; margin-top: 24px;
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150 }
151</style>
152</head>
153<body>
154
155<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>
156
157<h1>Web Feature Usage & Prioritization</h1>
158<div class="byline"><a href="https://webtransitions.org">webtransitions.org</a> — 2026-03-03</div>
159<p class="subtitle" style="max-width:900px;">
160 How often are web platform features actually used in the real world? This report explores a framework for answering that question, applied to the 415 features in the W3C’s <a href="https://web-platform-dx.github.io/web-features/">Baseline “Widely Available”</a> (BWA) set — the features that the <a href="https://web-platform-dx.github.io/web-features/faq/#what-are-the-core-browser-set-and-other-key-terms">core browser set</a> supports. We combine data from 6 independent sources: HTTP Archive page scans (~10.9M websites), Chrome telemetry (all Chrome page loads), and Firefox telemetry (desktop and mobile). Each feature gets a <strong>composite score</strong> estimating the fraction of web pages that use it (0–100%), plus a <strong>confidence level</strong> based on how many sources agree.
161</p>
162
163<!-- Data Source Coverage -->
164<div class="card" style="margin-bottom:24px;padding:14px 20px;">
165 <h3 style="margin-bottom:8px;">Data Source Coverage</h3>
166 <p style="font-size:12px;color:#666;margin-bottom:10px;">
167 Each number shows how many of the 415 BWA features that source can measure. The <strong>weight</strong> (w) controls how much each source influences the composite score.
168 </p>
169 <div class="coverage-grid">
170 <div class="coverage-item">
171 <div class="coverage-value">383</div>
172 <div class="coverage-desc"><strong>Have at least one signal</strong> — 92.3% of 415 BWA features</div>
173 </div>
174 <div class="coverage-item">
175 <div class="coverage-value">32</div>
176 <div class="coverage-desc"><strong>No data</strong> from any source</div>
177 </div>
178 <div class="coverage-item">
179 <div class="coverage-value">107</div>
180 <div class="coverage-desc"><strong>HTTP Archive (specific)</strong> — page content scans of ~10.9M sites · w=0.35</div>
181 </div>
182 <div class="coverage-item">
183 <div class="coverage-value">61</div>
184 <div class="coverage-desc"><strong>HTTP Archive (generic)</strong> — indirect parent-property matches · w=0.03</div>
185 </div>
186 <div class="coverage-item">
187 <div class="coverage-value">44</div>
188 <div class="coverage-desc"><strong>HTTP Archive (Blink)</strong> — JS API detection on crawled pages · w=0.20</div>
189 </div>
190 <div class="coverage-item">
191 <div class="coverage-value">383</div>
192 <div class="coverage-desc"><strong>ChromeStatus</strong> — Chrome telemetry across all page loads · w=0.15</div>
193 </div>
194 <div class="coverage-item">
195 <div class="coverage-value">82</div>
196 <div class="coverage-desc"><strong>Firefox Desktop</strong> — desktop telemetry · w=0.15</div>
197 </div>
198 <div class="coverage-item">
199 <div class="coverage-value">81</div>
200 <div class="coverage-desc"><strong>Firefox Fenix</strong> — mobile telemetry (only mobile signal) · w=0.15</div>
201 </div>
202 </div>
203</div>
204
205<!-- Confidence & Tier cards -->
206<div class="grid">
207<div class="card">
208 <h3>Composite Score Tiers</h3>
209 <p style="font-size:12px;color:#666;margin-bottom:12px;">The composite score estimates the fraction of web pages that use a feature. Features are grouped into tiers by that score. The right column shows what share of all 415 BWA features fall into each tier.</p>
210 <table style="width:100%;border-collapse:collapse;font-size:14px;">
211 <tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
212 <td style="padding:6px 0;"><span class="tier-high">>50% of pages</span></td>
213 <td style="text-align:right;font-weight:700;">14 features</td>
214 <td style="text-align:right;color:#666;">3.4% of BWA</td>
215 </tr>
216 <tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
217 <td style="padding:6px 0;"><span class="tier-med">10–50% of pages</span></td>
218 <td style="text-align:right;font-weight:700;">93 features</td>
219 <td style="text-align:right;color:#666;">22.4% of BWA</td>
220 </tr>
221 <tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
222 <td style="padding:6px 0;"><span class="tier-low">1–10% of pages</span></td>
223 <td style="text-align:right;font-weight:700;">100 features</td>
224 <td style="text-align:right;color:#666;">24.1% of BWA</td>
225 </tr>
226 <tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
227 <td style="padding:6px 0;"><span class="tier-vlow"><1% of pages</span></td>
228 <td style="text-align:right;font-weight:700;">176 features</td>
229 <td style="text-align:right;color:#666;">42.4% of BWA</td>
230 </tr>
231 <tr>
232 <td style="padding:6px 0;"><span class="tier-none">No data</span></td>
233 <td style="text-align:right;font-weight:700;">32 features</td>
234 <td style="text-align:right;color:#666;">7.7% of BWA</td>
235 </tr>
236 </table>
237</div>
238
239<div class="card">
240 <h3>Confidence Distribution</h3>
241 <p style="font-size:12px;color:#666;margin-bottom:12px;">Confidence reflects how well-corroborated a score is. More independent sources that agree = higher confidence. Confidence does not filter — all features are shown regardless of level.</p>
242 <table style="width:100%;border-collapse:collapse;font-size:14px;">
243 <tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
244 <td style="padding:6px 0;"><span class="confidence-tag high">High</span></td>
245 <td>3+ sources, all within 20 percentage points of each other</td>
246 <td style="text-align:right;font-weight:700;">67</td>
247 </tr>
248 <tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
249 <td style="padding:6px 0;"><span class="confidence-tag medium">Medium</span></td>
250 <td>2 sources, or 3+ sources that disagree by more than 20 percentage points</td>
251 <td style="text-align:right;font-weight:700;">150</td>
252 </tr>
253 <tr style="border-bottom:1px solid rgba(71,11,0,0.15);">
254 <td style="padding:6px 0;"><span class="confidence-tag low">Low</span></td>
255 <td>1 source only</td>
256 <td style="text-align:right;font-weight:700;">166</td>
257 </tr>
258 <tr>
259 <td style="padding:6px 0;"><span class="confidence-tag none">None</span></td>
260 <td>No data from any source</td>
261 <td style="text-align:right;font-weight:700;">32</td>
262 </tr>
263 </table>
264 <p style="font-size:12px;color:#888;margin-top:12px;">
265 Cross-validation: 83 features have both Chrome and Firefox data
266 </p>
267</div>
268</div>
269
270<!-- Charts -->
271<div class="grid">
272<div class="card">
273 <h3>Composite Score Distribution</h3>
274 <p style="font-size:12px;color:#666;margin-bottom:12px;">How many features fall into each composite-score range. Most features are used on fewer than 10% of pages — only a small set of widely-used CSS properties and APIs appear on more than half of all pages.</p>
275 <div class="chart-container"><canvas id="histogram"></canvas></div>
276</div>
277<div class="card">
278 <h3>Top 30 Features by Composite Score</h3>
279 <p style="font-size:12px;color:#666;margin-bottom:8px;">The highest-usage features across all sources. Bar color indicates confidence: <span style="color:#1f6e1f;font-weight:700;">green</span> = high (3+ agreeing sources), <span style="color:#8a5a00;font-weight:700;">amber</span> = medium (2 sources or wider disagreement), <span style="color:#4a4a8a;font-weight:700;">blue</span> = low (single source).</p>
280 <div class="chart-container tall"><canvas id="topChart"></canvas></div>
281</div>
282</div>
283
284<!-- Methodology notes -->
285<div class="notes">
286 <h3>Weighted Composite Scoring Methodology</h3>
287 <ul>
288 <li><strong>All sources contribute independently.</strong> Each source tells a different part of the story: site-weighted crawl data, Chrome telemetry, Firefox telemetry, mobile telemetry. The composite score blends them using measurement-class weights.</li>
289 <li><strong>Weights by measurement class:</strong> HTTP Archive page scans (specific)=0.35, HTTP Archive (generic)=0.03, HTTP Archive Blink detection=0.20, ChromeStatus=0.15, Firefox desktop=0.15, Firefox Fenix=0.15. When a source is missing, its weight is redistributed proportionally among available sources.</li>
290 <li><strong>Generic observables:</strong> Some features can only be detected via a parent property (e.g., subgrid is detected through <code>grid-template-columns</code>). These carry minimal weight (0.03) and are flagged, since the measurement is an upper bound — it confirms the parent property is used, not necessarily the specific sub-feature.</li>
291 <li><strong>Blink artifact discount:</strong> When Blink UseCounters report that canvas, webgl, or media interfaces appear on more than 45% of crawled pages, we halve that value before weighting. These interfaces show suspicious clustering (many report ~53.5% of pages) that likely reflects detection methodology rather than true usage.</li>
292 <li><strong>Firefox desktop and Fenix are separate signals,</strong> each weighted 0.15 — the same as ChromeStatus. Fenix is the only mobile usage signal in the dataset and carries equal weight to any other single telemetry source.</li>
293 <li><strong>All features are included regardless of confidence.</strong> High/medium/low/none confidence levels and flags annotate data quality so experts can evaluate the backing data themselves.</li>
294 <li><strong>Scale:</strong> All raw values are fractions from 0 to 1 (displayed as 0–100%). HTTP Archive values = fraction of ~10.9M crawled websites that contain the feature. ChromeStatus values = fraction of all Chrome page loads globally that trigger the feature. Firefox values = fraction of all Firefox page loads that trigger the feature. These denominators differ, so raw values across sources are not directly comparable — the composite score uses measurement-class weights to blend them.</li>
295 </ul>
296</div>
297
298<!-- Tabs: Feature Table and Cross-Validation -->
299<div class="card full" style="grid-column:auto;">
300 <div class="tab-bar">
301 <button class="tab-btn active" data-tab="features">Feature Table</button>
302 <button class="tab-btn" data-tab="crossval">Chrome-Firefox Cross-Validation</button>
303 </div>
304
305 <!-- Feature Table Tab -->
306 <div class="tab-panel active" id="tab-features" style="padding-top:16px;">
307 <p style="font-size:13px;color:#666;margin-bottom:12px;max-width:900px;">
308 Every Baseline “Widely Available” feature is listed below. <strong>Score</strong> is the weighted composite estimate of the fraction of web pages that use the feature. The individual source columns show raw values from each measurement system — these use different denominators and are not directly comparable. <strong>HA %</strong> = % of ~10.9M crawled websites containing the feature. <strong>Chrome %</strong> = % of all Chrome page loads triggering the feature. <strong>FF Desktop/Mobile %</strong> = % of Firefox page loads triggering the feature. Click any column header to sort.
309 </p>
310 <div class="filter-bar">
311 <input type="text" id="searchBox" placeholder="Filter by feature name...">
312 <select id="confidenceFilter">
313 <option value="all">All confidence</option>
314 <option value="high">High</option>
315 <option value="medium">Medium</option>
316 <option value="low">Low</option>
317 <option value="none">No data</option>
318 </select>
319 <select id="flagFilter">
320 <option value="all">All flags</option>
321 <option value="generic_observable_only">Generic observable</option>
322 <option value="blink_artifact_suspected">Blink artifact</option>
323 <option value="single_source">Single source</option>
324 <option value="chrome_firefox_divergent">Chrome-Firefox divergent</option>
325 <option value="mobile_divergent">Mobile divergent</option>
326 <option value="no_flags">No flags</option>
327 </select>
328 <select id="sourceAvailFilter">
329 <option value="all">All sources</option>
330 <option value="ha_custom_metrics">Has HA custom</option>
331 <option value="ha_blink_features">Has HA blink</option>
332 <option value="chromestatus">Has ChromeStatus</option>
333 <option value="firefox_desktop">Has Firefox desktop</option>
334 <option value="firefox_fenix">Has Firefox Fenix</option>
335 <option value="none">No data</option>
336 </select>
337 <select id="groupFilter">
338 <option value="all">All groups</option>
339 <option value="CSS">CSS</option>
340 <option value="API">API</option>
341 <option value="JS">JS</option>
342 <option value="HTML">HTML</option>
343 <option value="SVG">SVG</option>
344 <option value="Wasm">Wasm</option>
345 <option value="HTTP">HTTP</option>
346 <option value="Manifest">Manifest</option>
347 </select>
348 <span class="count" id="rowCount"></span>
349 </div>
350 <div class="feature-table-wrap">
351 <table class="ftable" id="featureTable">
352 <thead>
353 <tr>
354 <th data-col="rank" style="text-align:right;">#<span class="sort-arrow"></span></th>
355 <th data-col="group">Grp<span class="sort-arrow"></span></th>
356 <th data-col="name">Feature<span class="sort-arrow"></span></th>
357 <th data-col="score" style="text-align:right;" title="Weighted composite usage estimate across all available sources">Score<span class="sort-arrow"></span></th>
358 <th data-col="confidence" title="How well-corroborated: high = 3+ agreeing sources, medium = 2 or disagreement, low = 1 source">Conf<span class="sort-arrow"></span></th>
359 <th data-col="ha_custom" style="text-align:right;" title="HTTP Archive: % of ~10.9M crawled websites where this feature was found in page content">HA%<span class="sort-arrow"></span></th>
360 <th data-col="chromestatus" style="text-align:right;" title="ChromeStatus: % of all Chrome page loads that triggered this feature">Chrome%<span class="sort-arrow"></span></th>
361 <th data-col="ff_desktop" style="text-align:right;" title="Firefox desktop: % of all Firefox desktop page loads that triggered this feature">FF Desk%<span class="sort-arrow"></span></th>
362 <th data-col="ff_fenix" style="text-align:right;" title="Firefox Fenix (Android): % of all Fenix mobile page loads that triggered this feature">FF Mob%<span class="sort-arrow"></span></th>
363 <th data-col="sources" style="text-align:center;" title="How many independent data sources have a measurement for this feature">Src<span class="sort-arrow"></span></th>
364 <th data-col="flags" title="Data quality annotations: generic = indirect HA match, single-src = only one source, Cr/FF-div = Chrome and Firefox disagree">Flags<span class="sort-arrow"></span></th>
365 </tr>
366 </thead>
367 <tbody id="featureBody"></tbody>
368 </table>
369 </div>
370 </div>
371
372 <!-- Cross-Validation Tab -->
373 <div class="tab-panel" id="tab-crossval" style="padding-top:16px;">
374 <p style="font-size:13px;color:#666;margin-bottom:12px;max-width:900px;">
375 For 83 features, we have usage data from both Chrome-ecosystem sources (HTTP Archive or ChromeStatus) and Firefox telemetry. This table compares them side by side. <strong>Delta</strong> is the absolute difference between the best Chrome signal and Firefox desktop. When Chrome and Firefox independently agree on usage levels, we can be more confident in the estimate. Large divergences may indicate measurement differences, browser-specific implementations, or features with genuinely different adoption across browsers. Sorted by biggest disagreements first.
376 </p>
377 <div class="feature-table-wrap">
378 <table class="ftable" id="crossvalTable">
379 <thead>
380 <tr>
381 <th data-cvcol="name">Feature <span class="sort-arrow"></span></th>
382 <th data-cvcol="chrome" title="Best available Chrome-ecosystem signal (HA page scan preferred over ChromeStatus telemetry)">Best Chrome % <span class="sort-arrow"></span></th>
383 <th data-cvcol="chrome_source" title="Which Chrome-ecosystem source provided the value">Source <span class="sort-arrow"></span></th>
384 <th data-cvcol="ff_desktop" title="% of Firefox desktop page loads that triggered this feature">FF Desktop % <span class="sort-arrow"></span></th>
385 <th data-cvcol="ff_fenix" title="% of Firefox Fenix (Android) page loads that triggered this feature">FF Mobile % <span class="sort-arrow"></span></th>
386 <th data-cvcol="delta" title="Absolute difference between Best Chrome % and FF Desktop %">Delta <span class="sort-arrow"></span></th>
387 <th data-cvcol="agreement" title="Agree = <5% delta, Diverge = 5-15%, Strongly Diverge = >15%">Agreement <span class="sort-arrow"></span></th>
388 </tr>
389 </thead>
390 <tbody id="crossvalBody"></tbody>
391 </table>
392 </div>
393 </div>
394</div>
395
396<div class="footer">
397 Web Feature Usage & Prioritization — Generated 2026-03-03 — <a href="https://webtransitions.org">webtransitions.org</a>
398</div>
399
400<script>
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404
405// ── Tab switching ────────────────────────────────────────────────────
406document.querySelectorAll('.tab-btn').forEach(btn => {
407 btn.addEventListener('click', () => {
408 document.querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
409 document.querySelectorAll('.tab-panel').forEach(p => p.classList.remove('active'));
410 btn.classList.add('active');
411 document.getElementById('tab-' + btn.dataset.tab).classList.add('active');
412 });
413});
414
415// ── Group labels ─────────────────────────────────────────────────────
416const groupLabels = {
417 css_property: 'CSS', css_selector: 'CSS', css_atrule: 'CSS', css_type: 'CSS',
418 blink_api: 'API', html_element: 'HTML', svg: 'SVG',
419 js_builtin: 'JS', js_operators: 'JS', js_grammar: 'JS', js_statements: 'JS',
420 webassembly: 'Wasm', manifests: 'Manifest', http: 'HTTP',
421};
422function groupPrefix(type) {
423 const label = groupLabels[type] || '';
424 return label ? label + ': ' : '';
425}
426function groupTag(type) {
427 const label = groupLabels[type] || '';
428 if (!label) return '';
429 const colors = {
430 CSS: 'background:rgba(31,110,31,0.10);color:#1f6e1f',
431 API: 'background:rgba(74,74,138,0.10);color:#4a4a8a',
432 JS: 'background:rgba(138,90,0,0.10);color:#8a5a00',
433 HTML: 'background:rgba(184,110,0,0.10);color:#b86e00',
434 SVG: 'background:rgba(0,128,128,0.10);color:#006868',
435 Wasm: 'background:rgba(100,100,100,0.10);color:#555',
436 Manifest: 'background:rgba(128,0,128,0.10);color:#800080',
437 HTTP: 'background:rgba(0,100,180,0.10);color:#0064b4',
438 };
439 return '<span style="display:inline-block;padding:1px 5px;border-radius:3px;font-size:10px;font-weight:600;margin-right:4px;' + (colors[label] || '') + '">' + label + '</span>';
440}
441
442// ── Histogram chart ──────────────────────────────────────────────────
443const 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%"];
444const histCounts = [176,64,36,52,17,14,10,6,2,4,2,0];
445
446new Chart(document.getElementById('histogram'), {
447 type: 'bar',
448 data: {
449 labels: histLabels,
450 datasets: [{
451 label: 'Features',
452 data: histCounts,
453 backgroundColor: histLabels.map((_, i) => {
454 const t = i / (histLabels.length - 1);
455 if (t > 0.7) return 'rgba(31, 110, 31, 0.7)';
456 if (t > 0.3) return 'rgba(138, 90, 0, 0.7)';
457 return 'rgba(71, 11, 0, 0.4)';
458 }),
459 borderRadius: 4,
460 }]
461 },
462 options: {
463 responsive: true, maintainAspectRatio: false,
464 plugins: { legend: { display: false } },
465 scales: {
466 y: { beginAtZero: true, title: { display: true, text: 'Number of features' } },
467 x: { title: { display: true, text: 'Composite score range' } }
468 }
469 }
470});
471
472// ── Top-N bar chart ──────────────────────────────────────────────────
473const topData = [{"name":"not","score":0.8656656324736405,"confidence":"medium","group":"css_selector"},{"name":"outline","score":0.8191427775305281,"confidence":"medium","group":"css_property"},{"name":"flexbox","score":0.7873692521553166,"confidence":"medium","group":"css_property"},{"name":"ua-client-hints","score":0.74314817,"confidence":"low","group":"blink_api"},{"name":"slot","score":0.7272946273309514,"confidence":"medium","group":"blink_api"},{"name":"overflow-shorthand","score":0.7248557350732046,"confidence":"medium","group":"css_property"},{"name":"intersection-observer","score":0.6371315618062399,"confidence":"medium","group":"blink_api"},{"name":"request-animation-frame","score":0.61653786,"confidence":"low","group":"blink_api"},{"name":"beforeunload","score":0.57920782,"confidence":"low","group":"blink_api"},{"name":"flexbox-gap","score":0.5762004807930401,"confidence":"medium","group":"css_property"},{"name":"text-indent","score":0.5694312336037088,"confidence":"medium","group":"css_property"},{"name":"appearance","score":0.5592665184722225,"confidence":"high","group":"css_property"},{"name":"grid","score":0.541520312907038,"confidence":"medium","group":"css_property"},{"name":"focus-visible","score":0.5155652792777368,"confidence":"medium","group":"css_selector"},{"name":"aborting","score":0.47132189,"confidence":"low","group":"blink_api"},{"name":"slot-assign","score":0.4679395573309514,"confidence":"medium","group":"blink_api"},{"name":"background-clip-text","score":0.45851828876220346,"confidence":"medium","group":"css_property"},{"name":"referrer-policy","score":0.45008361646878603,"confidence":"medium","group":"blink_api"},{"name":"requestidlecallback","score":0.4484389,"confidence":"low","group":"blink_api"},{"name":"fetch-priority","score":0.447286266468786,"confidence":"medium","group":"blink_api"},{"name":"clip-path","score":0.43005592540953386,"confidence":"high","group":"svg"},{"name":"js-modules","score":0.4160364329787946,"confidence":"medium","group":"js_operators"},{"name":"layout-instability","score":0.41411571,"confidence":"low","group":"blink_api"},{"name":"nullish-coalescing","score":0.40702124,"confidence":"low","group":"js_operators"},{"name":"has","score":0.3992554114896352,"confidence":"medium","group":"css_selector"},{"name":"zstd","score":0.37684414,"confidence":"low","group":"http"},{"name":"scrollbar-width","score":0.3726249100674747,"confidence":"high","group":"css_property"},{"name":"will-change","score":0.3649191819592097,"confidence":"high","group":"css_property"},{"name":"logical-properties","score":0.3647644004009415,"confidence":"high","group":"css_property"},{"name":"is","score":0.3585600717456203,"confidence":"medium","group":"css_selector"}];
474
475new Chart(document.getElementById('topChart'), {
476 type: 'bar',
477 data: {
478 labels: topData.map(d => groupPrefix(d.group) + d.name),
479 datasets: [{
480 label: 'Composite Score %',
481 data: topData.map(d => +(d.score * 100).toFixed(2)),
482 backgroundColor: topData.map(d => {
483 if (d.confidence === 'high') return 'rgba(31, 110, 31, 0.7)';
484 if (d.confidence === 'medium') return 'rgba(138, 90, 0, 0.7)';
485 return 'rgba(74, 74, 138, 0.7)';
486 }),
487 borderRadius: 3,
488 }]
489 },
490 options: {
491 indexAxis: 'y',
492 responsive: true, maintainAspectRatio: false,
493 plugins: {
494 legend: { display: false },
495 tooltip: {
496 callbacks: {
497 afterLabel: function(ctx) {
498 return 'Confidence: ' + topData[ctx.dataIndex].confidence;
499 }
500 }
501 }
502 },
503 scales: {
504 x: { beginAtZero: true, max: 100, title: { display: true, text: 'Composite Score %' } },
505 y: { ticks: { font: { size: 11 } } }
506 }
507 }
508});
509
510// ── Helper functions ─────────────────────────────────────────────────
511
512function fmtPct(v) {
513 if (v == null) return '<span class="tier-none">--</span>';
514 const pct = v * 100;
515 const cls = pct > 50 ? 'tier-high' : pct >= 10 ? 'tier-med' : pct >= 1 ? 'tier-low' : 'tier-vlow';
516 if (pct < 0.01) return '<span class="' + cls + '">' + pct.toFixed(4) + '%</span>';
517 if (pct < 1) return '<span class="' + cls + '">' + pct.toFixed(3) + '%</span>';
518 return '<span class="' + cls + '">' + pct.toFixed(2) + '%</span>';
519}
520
521function confidenceTag(c) {
522 return '<span class="confidence-tag ' + c + '">' + c + '</span>';
523}
524
525function flagTags(flags) {
526 if (!flags || flags.length === 0) return '';
527 const labels = {
528 generic_observable_only: 'generic',
529 blink_artifact_suspected: 'blink-artifact',
530 single_source: 'single-src',
531 chrome_firefox_divergent: 'Cr/FF-div',
532 mobile_divergent: 'mobile-div',
533 };
534 return flags.map(f => '<span class="flag-tag">' + (labels[f] || f) + '</span>').join('');
535}
536
537function agreementTag(a) {
538 const labels = { agree: 'Agree', diverge: 'Diverge', strongly_diverge: 'Strongly Diverge', no_desktop_firefox: 'No FF Desktop' };
539 return '<span class="agreement-tag ' + a + '">' + (labels[a] || a) + '</span>';
540}
541
542function getHaPct(f) {
543 if (f.signals.ha_custom_metrics) return f.signals.ha_custom_metrics.pct;
544 if (f.recovered && f.recovered.ha_generic_observable) return f.recovered.ha_generic_observable.pct;
545 if (f.signals.ha_blink_features) return f.signals.ha_blink_features.pct;
546 return null;
547}
548
549function getChromeStatusPct(f) {
550 return f.signals.chromestatus ? f.signals.chromestatus.pct : null;
551}
552
553function getFFDesktopPct(f) {
554 return f.signals.firefox_desktop ? f.signals.firefox_desktop.pct : null;
555}
556
557function getFFFenixPct(f) {
558 return f.signals.firefox_fenix ? f.signals.firefox_fenix.pct : null;
559}
560
561// ── Feature table: Sortable, filterable ──────────────────────────────
562const tbody = document.getElementById('featureBody');
563const searchBox = document.getElementById('searchBox');
564const confidenceFilter = document.getElementById('confidenceFilter');
565const flagFilter = document.getElementById('flagFilter');
566const sourceAvailFilter = document.getElementById('sourceAvailFilter');
567const groupFilterEl = document.getElementById('groupFilter');
568const rowCountEl = document.getElementById('rowCount');
569
570let sortCol = 'score';
571let sortAsc = false;
572
573function sortFeatures(arr) {
574 const dir = sortAsc ? 1 : -1;
575 return [...arr].sort((a, b) => {
576 const nv = (col, fn) => {
577 const va = fn(a), vb = fn(b);
578 if (va == null && vb == null) return a.name.localeCompare(b.name);
579 if (va == null) return 1;
580 if (vb == null) return -1;
581 return dir * (va - vb);
582 };
583 if (sortCol === 'name') return dir * a.name.localeCompare(b.name);
584 if (sortCol === 'group') {
585 const ga = groupLabels[a.primary_type] || 'zzz';
586 const gb = groupLabels[b.primary_type] || 'zzz';
587 return dir * ga.localeCompare(gb);
588 }
589 if (sortCol === 'score') return nv('score', f => f.composite.score);
590 if (sortCol === 'ha_custom') return nv('ha_custom', getHaPct);
591 if (sortCol === 'chromestatus') return nv('chromestatus', getChromeStatusPct);
592 if (sortCol === 'ff_desktop') return nv('ff_desktop', getFFDesktopPct);
593 if (sortCol === 'ff_fenix') return nv('ff_fenix', getFFFenixPct);
594 if (sortCol === 'confidence') {
595 const order = { high: 0, medium: 1, low: 2, none: 3 };
596 return dir * ((order[a.composite.confidence] || 9) - (order[b.composite.confidence] || 9));
597 }
598 if (sortCol === 'sources') return dir * (a.composite.source_count - b.composite.source_count);
599 if (sortCol === 'flags') return dir * ((a.composite.flags.length || 0) - (b.composite.flags.length || 0));
600 if (sortCol === 'rank') return dir * (features.indexOf(a) - features.indexOf(b));
601 return 0;
602 });
603}
604
605function renderFeatures() {
606 const search = searchBox.value.toLowerCase();
607 const confVal = confidenceFilter.value;
608 const flagVal = flagFilter.value;
609 const srcVal = sourceAvailFilter.value;
610 const grpVal = groupFilterEl.value;
611
612 let filtered = features.filter(f => {
613 if (search && !f.name.toLowerCase().includes(search)) return false;
614 if (grpVal !== 'all' && (groupLabels[f.primary_type] || '') !== grpVal) return false;
615 if (confVal !== 'all' && f.composite.confidence !== confVal) return false;
616 if (flagVal !== 'all') {
617 if (flagVal === 'no_flags') {
618 if (f.composite.flags.length > 0) return false;
619 } else {
620 if (!f.composite.flags.includes(flagVal)) return false;
621 }
622 }
623 if (srcVal !== 'all') {
624 if (srcVal === 'none') {
625 if (f.composite.source_count > 0) return false;
626 } else if (srcVal === 'ha_custom_metrics') {
627 if (!f.signals.ha_custom_metrics && !(f.recovered && f.recovered.ha_generic_observable)) return false;
628 } else {
629 if (!f.signals[srcVal]) return false;
630 }
631 }
632 return true;
633 });
634
635 filtered = sortFeatures(filtered);
636 rowCountEl.textContent = filtered.length + ' of ' + features.length + ' features';
637
638 const haLabel = (f) => {
639 if (f.signals.ha_custom_metrics) return '';
640 if (f.recovered && f.recovered.ha_generic_observable)
641 return ' <span style="color:#999;font-size:10px;">(generic)</span>';
642 if (f.signals.ha_blink_features)
643 return ' <span style="color:#999;font-size:10px;">(blink)</span>';
644 return '';
645 };
646
647 const rows = filtered.map((f, i) => {
648 const mdnUrl = 'https://developer.mozilla.org/en-US/search?q=' + encodeURIComponent(f.name.replace(/-/g, ' '));
649 return '<tr>'
650 + '<td class="num">' + (i + 1) + '</td>'
651 + '<td>' + groupTag(f.primary_type) + '</td>'
652 + '<td><a href="' + mdnUrl + '" target="_blank" style="text-decoration:none;color:inherit;"><strong>' + f.name + '</strong></a></td>'
653 + '<td class="num">' + fmtPct(f.composite.score) + '</td>'
654 + '<td>' + confidenceTag(f.composite.confidence) + '</td>'
655 + '<td class="num">' + fmtPct(getHaPct(f)) + haLabel(f) + '</td>'
656 + '<td class="num">' + fmtPct(getChromeStatusPct(f)) + '</td>'
657 + '<td class="num">' + fmtPct(getFFDesktopPct(f)) + '</td>'
658 + '<td class="num">' + fmtPct(getFFFenixPct(f)) + '</td>'
659 + '<td class="num" style="text-align:center;">' + f.composite.source_count + '</td>'
660 + '<td>' + flagTags(f.composite.flags) + '</td>'
661 + '</tr>';
662 });
663
664 tbody.innerHTML = rows.join('');
665}
666
667// Sort click handler for feature table
668document.querySelectorAll('#featureTable th[data-col]').forEach(th => {
669 th.addEventListener('click', () => {
670 const col = th.dataset.col;
671 if (sortCol === col) { sortAsc = !sortAsc; }
672 else { sortCol = col; sortAsc = col === 'name'; }
673 document.querySelectorAll('#featureTable th[data-col] .sort-arrow').forEach(el => el.textContent = '');
674 th.querySelector('.sort-arrow').textContent = sortAsc ? ' \u25B2' : ' \u25BC';
675 renderFeatures();
676 });
677});
678
679searchBox.addEventListener('input', renderFeatures);
680groupFilterEl.addEventListener('change', renderFeatures);
681confidenceFilter.addEventListener('change', renderFeatures);
682flagFilter.addEventListener('change', renderFeatures);
683sourceAvailFilter.addEventListener('change', renderFeatures);
684
685// Initial render
686renderFeatures();
687document.querySelector('#featureTable th[data-col="score"] .sort-arrow').textContent = ' \u25BC';
688
689// ── Cross-validation table ───────────────────────────────────────────
690const cvBody = document.getElementById('crossvalBody');
691let cvSortCol = 'delta';
692let cvSortAsc = false;
693
694const chromeSourceLabels = {
695 ha_custom_metrics: 'HA Custom',
696 ha_blink_features: 'HA Blink',
697 chromestatus: 'ChromeStatus',
698};
699
700function sortCV(arr) {
701 const dir = cvSortAsc ? 1 : -1;
702 return [...arr].sort((a, b) => {
703 const nv = (fn) => {
704 const va = fn(a), vb = fn(b);
705 if (va == null && vb == null) return 0;
706 if (va == null) return 1;
707 if (vb == null) return -1;
708 return dir * (va - vb);
709 };
710 if (cvSortCol === 'name') return dir * a.name.localeCompare(b.name);
711 if (cvSortCol === 'chrome') return nv(x => x.chrome_value);
712 if (cvSortCol === 'ff_desktop') return nv(x => x.firefox_desktop);
713 if (cvSortCol === 'ff_fenix') return nv(x => x.firefox_fenix);
714 if (cvSortCol === 'delta') return nv(x => x.delta);
715 if (cvSortCol === 'chrome_source') return dir * a.chrome_source.localeCompare(b.chrome_source);
716 if (cvSortCol === 'agreement') {
717 const order = { strongly_diverge: 0, diverge: 1, agree: 2, no_desktop_firefox: 3 };
718 return dir * ((order[a.agreement] || 9) - (order[b.agreement] || 9));
719 }
720 return 0;
721 });
722}
723
724function renderCV() {
725 const sorted = sortCV(crossValidation);
726 const rows = sorted.map(cv => {
727 return '<tr>'
728 + '<td><strong>' + cv.name + '</strong></td>'
729 + '<td>' + fmtPct(cv.chrome_value) + '</td>'
730 + '<td style="font-size:11px;">' + (chromeSourceLabels[cv.chrome_source] || cv.chrome_source) + '</td>'
731 + '<td>' + fmtPct(cv.firefox_desktop) + '</td>'
732 + '<td>' + fmtPct(cv.firefox_fenix) + '</td>'
733 + '<td>' + (cv.delta != null ? (cv.delta * 100).toFixed(2) + '%' : '--') + '</td>'
734 + '<td>' + agreementTag(cv.agreement) + '</td>'
735 + '</tr>';
736 });
737 cvBody.innerHTML = rows.join('');
738}
739
740document.querySelectorAll('#crossvalTable th[data-cvcol]').forEach(th => {
741 th.addEventListener('click', () => {
742 const col = th.dataset.cvcol;
743 if (cvSortCol === col) { cvSortAsc = !cvSortAsc; }
744 else { cvSortCol = col; cvSortAsc = col === 'name'; }
745 document.querySelectorAll('#crossvalTable th[data-cvcol] .sort-arrow').forEach(el => el.textContent = '');
746 th.querySelector('.sort-arrow').textContent = cvSortAsc ? ' \u25B2' : ' \u25BC';
747 renderCV();
748 });
749});
750
751renderCV();
752document.querySelector('#crossvalTable th[data-cvcol="delta"] .sort-arrow').textContent = ' \u25BC';
753</script>
754
755</body>
756</html>