Weekly hardening: v154 coverage (WebSocket options bag + text-decoration-inset) and v147 MDN-shape upgrade

[PaulKinlan]

Weekly hardening run (2026-09-20). Chromestatus channels moved to stable 154 / beta 155 / dev 156 — the repo had no v154+ pages, so coverage came first, then two MDN-shape upgrades from the v147 backlog.

Coverage — Chrome 154 (stable on 2026-09-22)

v154/add-options-bag-to-websocket-constructor/ — full reference (overview + 2 child pages: the constructor overload and the WebSocketInit dictionary).

• IDL quoted verbatim from whatwg/websockets PR #76 and Chromium trunk (websocket.idl, websocket_init.idl); routing behavior sourced from dom_websocket.cc and Web IDL union/sequence conversion.
• Documents two real gotchas: { protocols: "soap" } throws TypeError (the member is strictly a sequence — the ChromeStatus summary's own example doesn't match the IDL), and unknown dictionary members are silently ignored.
• Honestly discloses the status conflict: the milestone-154 listing files it "Enabled by default", but trunk's WebSocketOptionBag flag is still experimental, the promote-to-stable CL 8256918 is open, and the spec PR is unmerged under web-compat review. Warn-block + feature-detect pattern included.
• implementation-sufficient reference contract (4 inventory items, 23 sources), immutable conformance suite (20 pass / 0 fail), critique with guidanceConsulted, mobile+desktop matrix ok (screenshots read). Showcase demo both-forms embedded (HEAD 200).

v154/css-text-decoration-inset/ — MDN stub. MDN's new-layout page is substantive (ChromeStatus links it itself), so gendn points there and records what MDN doesn't: listing bucket vs the still-experimental CSSTextDecorationInset flag, BCD (Chrome false / Firefox 146 / Safari TP), no webstatus entry, CL 7748204, showcase route.

MDN upgrades — v147 backlog (2 pages this run)

v147/lazy-loading-for-video-and-audio-elements/ — in-place upgrade, same route/identity. The page still claimed dev-trial status; in reality WHATWG HTML PR #11980 merged 2026-03-23 and the attribute shipped (Chrome 148 partial / 150 full per BCD, flag now stable). Added Baseline banner (loading-lazy-media, limited), formal Syntax section (verbatim enumerated-attribute grammar + HTMLMediaElement.loading reflection), real BCD per-version compat table with the <source> caveat (crbug 514611050), security/privacy section, live showcase iframe, linked every previously plain-text citation, mobile overflow protections. New reference-contract.json + critique.

v147/update-device-memory-api-limits/ — in-place upgrade, same route/identity. Fixed the exact unlinked-citation pattern CLAUDE.md calls out (plain-text "mail-archive msg15601" — now linked alongside the Groups thread). Added Baseline banner (device-memory, limited), Syntax section (spec IDL + verbatim Sec-CH-Device-Memory = sf-decimal ABNF + w3c/device-memory PR #53's implementation-defined bounds, merged 2026-01-19), BCD-anchored compat table quoting BCD's own Chrome-147 version notes, security/privacy section, live showcase iframe (memory-inspector), stale MDN header URL updated to the new /Reference/ layout. New reference-contract.json + critique.

Gates (all green before each push)

check-routes, validate-artifacts, test-reference-contract, check-conformance, deno fmt --check, deno check server.ts; per-page conformance runs 20/17/19/18 pass, 0 fail; responsive matrix run with CDP mobile emulation and screenshots read for every touched route (responsive-support.json updated to ok with method notes).

Honest remainder

~118 pages across v147–v150 are still in the pre-MDN shape (2 of ~13 built v147 old-shape pages upgraded this run; the rest of v147's 33 pages are stubs or already-shaped); v154 has 17 more listed features without pages, and v155/v156 have none yet. Recorded as high-priority followUpGoals entries so the backlog burns down wave by wave.

🤖 Generated with Claude Code

https://claude.ai/code/session_017hFhoS24xY2u3ctcHNkeNR

[Copilot]

Copilot review overview

🟡 Changes recommended

Unresolved issues remain in generated reports, accessibility markup, and experimental-feature disclosure.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 4

Open (4)

• Regenerate index from the full conformance run · New
• Regenerate responsive report from the unfiltered run · New
• Regenerate aggregate reports from the full run · New
• Add an experimental API warning before the MDN card · New

What changed in this PR

Adds Chrome 154 references and upgrades the v147 lazy-media documentation with refreshed compatibility, conformance, and responsive artifacts.

Changes:

• Adds WebSocket options-bag documentation and a text-decoration-inset MDN stub.
• Upgrades lazy media syntax, compatibility, security, and examples.
• Updates contracts, reports, responsive data, and follow-up goals.

File	Reviewed change
v154/​css-text-decoration-inset/​index.html	Adds MDN stub and metadata.
v154/​css-text-decoration-inset/​conformance.json	Adds stub conformance suite.
v154/​add-options-bag-to-websocket-constructor/​websocketinit/​index.html	Documents WebSocketInit.
v154/​add-options-bag-to-websocket-constructor/​websocket-constructor/​index.html	Documents the constructor overload.
v154/​add-options-bag-to-websocket-constructor/​reference-contract.json	Adds source inventory and mappings.
v154/​add-options-bag-to-websocket-constructor/​index.html	Adds WebSocket options-bag overview.
v154/​add-options-bag-to-websocket-constructor/​conformance.json	Adds immutable conformance suite.
v154/​add-options-bag-to-websocket-constructor/​_questions.json	Records critique and follow-ups.
v147/​lazy-loading-for-video-and-audio-elements/​reference-contract.json	Adds reference contract.
v147/​lazy-loading-for-video-and-audio-elements/​index.html	Upgrades documentation and compatibility guidance.
v147/​lazy-loading-for-video-and-audio-elements/​_questions.json	Records upgrade critique and goals.
responsive-support.json	Updates responsive matrix records.
reports/​conformance/​results.json	Updates conformance rollup.
reports/​conformance/​responsive.json	Updates responsive report.
reports/​conformance/​index.html	Updates rendered conformance summary.
goals.json	Updates follow-up goals.

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