we (web engine): Experimental web browser project to understand the limits of Claude
Add Phase 17: Navigation & Browser Chrome to development plan
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
+17
+17
PLAN.md
+17
PLAN.md
···
215
215
216
216
**Test milestone:** Interactive form on a real web page (e.g., search box submission).
217
217
218
+
## Phase 17: Navigation & Browser Chrome
219
+
220
+
**Goal:** Enable page navigation via links, address bar, and browser chrome, with full history support.
221
+
222
+
- Link click navigation: clicking `<a href="...">` navigates to the target URL (resolve relative URLs, initiate page load, replace document)
223
+
- `window.location` Location object: `href`, `protocol`, `host`, `hostname`, `port`, `pathname`, `search`, `hash`, `origin`, `assign()`, `replace()`, `reload()`
224
+
- Navigation history stack: ordered list of session history entries (URL, scroll position, state), back/forward traversal, current entry tracking
225
+
- `window.history` History API: `pushState()`, `replaceState()`, `back()`, `forward()`, `go()`, `length`, `state`, `popstate` event
226
+
- HTTP redirect following: 301, 302, 303, 307, 308 during navigation, redirect chain limit, method changes (303→GET, 307/308 preserve)
227
+
- Fragment navigation: `#id` same-document scrolling, `hashchange` event, no page reload for fragment-only changes
228
+
- Page lifecycle events: `DOMContentLoaded`, `load`, `beforeunload`, `unload` in correct order, `beforeunload` cancellation
229
+
- Browser chrome UI: address bar (URL display + text input), back/forward/reload buttons, keyboard shortcuts (Cmd+L, Cmd+R, Cmd+[/])
230
+
- Error pages: DNS failure, connection refused, TLS errors, HTTP 4xx/5xx, network timeout — user-friendly display with reload option
231
+
- Content-type routing: HTML → parser, plain text → monospace rendering, images → direct display, unsupported → download prompt
232
+
233
+
**Test milestone:** Click a link on a real web page and navigate to the destination. Use back button to return.
234
+
218
235
---
219
236
220
237
## Test Suites