Weekly github digest (HTML specs)

Issues
------
* w3c/html-aria (+1/-0/💬0)
  1 issues created:
  - Clarify: should `<header>` inside `<dialog>` retain `role=banner`? (by johanrd)
    https://github.com/w3c/html-aria/issues/579 

* w3c/webcomponents (+1/-0/💬1)
  1 issues created:
  - Streaming DSD (by henrijoss)
    https://github.com/WICG/webcomponents/issues/1123 

  1 issues received 1 new comments:
  - #1098 Reference Target: How to handle events fired on the reference target by related elements? (1 by dandclark)
    https://github.com/WICG/webcomponents/issues/1098 

* whatwg/html (+5/-4/💬33)
  5 issues created:
  - Ease setting the size of a canvas to match CSS (by Kaiido)
    https://github.com/whatwg/html/issues/12417 [addition/proposal] [needs implementer interest] [topic: canvas] 
  - Initial about:blank window reuse changes active document too early (by shannonbooth)
    https://github.com/whatwg/html/issues/12415 
  - Upcoming WHATNOT meeting on 20YY-MM-DD (by jstenback)
    https://github.com/whatwg/html/issues/12413 [agenda+] 
  - Meeting 42 for joint OpenUI-WHATWG/HTML-CSSWG task force on styleable form controls (by mfreed7)
    https://github.com/whatwg/html/issues/12412 
  - Should cross-origin isolation be part of the agent cluster key? (by annevk)
    https://github.com/whatwg/html/issues/12408 [security/privacy] [topic: workers] [topic: cross-origin-opener-policy] [topic: cross-origin-embedder-policy] 

  17 issues received 33 new comments:
  - #12417 Ease setting the size of a canvas to match CSS (3 by Kaiido, schenney-chromium)
    https://github.com/whatwg/html/issues/12417 [addition/proposal] [needs implementer interest] [topic: canvas] 
  - #12412 Meeting 42 for joint OpenUI-WHATWG/HTML-CSSWG task force on styleable form controls (2 by mfreed7)
    https://github.com/whatwg/html/issues/12412 
  - #12408 Should cross-origin isolation be part of the agent cluster key? (3 by annevk, truongminhdien8330-web, zcorpan)
    https://github.com/whatwg/html/issues/12408 [security/privacy] [topic: workers] [topic: cross-origin-opener-policy] [topic: cross-origin-embedder-policy] 
  - #12404 Does the "shadow root" concept include UA shadow roots? (4 by mfreed7, sb3nder, smaug----)
    https://github.com/whatwg/html/issues/12404 [topic: shadow] 
  - #12401 Upcoming WHATNOT meeting on 2026-04-30 (4 by KurtCattiSchmidt, jstenback, stephanieyzhang)
    https://github.com/whatwg/html/issues/12401 [agenda+] 
  - #12388 SpellCheck Custom Dictionary / exemptions (1 by jstenback)
    https://github.com/whatwg/html/issues/12388 [addition/proposal] [needs implementer interest] [stage: 1] 
  - #12380 Meeting 41 for joint OpenUI-WHATWG/HTML-CSSWG task force on styleable form controls (2 by lukewarlow, mfreed7)
    https://github.com/whatwg/html/issues/12380 
  - #12370 Upcoming WHATNOT meeting on 2026-04-16 (1 by kbabbitt)
    https://github.com/whatwg/html/issues/12370 
  - #12363 Clarify `EventSource` behavior for documents entering and restoring from BFCache (1 by zp1996)
    https://github.com/whatwg/html/issues/12363 [topic: history] [topic: eventsource] 
  - #12338 Unexpected behavior of `interestfor` with popover controls (1 by mfreed7)
    https://github.com/whatwg/html/issues/12338 [topic: popover] [topic: button] 
  - #10673 Declarative CSS Modules and Declarative Shadow DOM `adoptedstylesheets` attribute (1 by lukewarlow)
    https://github.com/whatwg/html/issues/10673 [addition/proposal] [needs implementer interest] [topic: shadow] [topic: script] [stage: 2] [topic: imports/exports] 
  - #10378 HTML Video Poster Image: Enable Responsive Images and ALT Text for Poster  (4 by jstenback, scottjehl)
    https://github.com/whatwg/html/issues/10378 [addition/proposal] [needs implementer interest] [topic: media] [agenda+] 
  - #10262 Can messageerror fire on Worker? (1 by annevk)
    https://github.com/whatwg/html/issues/10262 [topic: workers] [topic: serialize and transfer] 
  - #9936 A popover on top of a modal dialog should be interactable (1 by leohumnew)
    https://github.com/whatwg/html/issues/9936 [topic: dialog] [topic: popover] 
  - #3998 Consider a blocklist for schemes instead of a safelist (1 by joshtriplett)
    https://github.com/whatwg/html/issues/3998 [addition/proposal] [topic: custom protocols] 
  - #3748 UA shadow roots are observable via inheritance.  (2 by dbaron, emilio)
    https://github.com/whatwg/html/issues/3748 [topic: shadow] [topic: rendering] 
  - #3099 Define behavior for `file://` documents' origin. (1 by shannonbooth)
    https://github.com/whatwg/html/issues/3099 [security/privacy] [topic: origin] [topic: cookie] 

  4 issues closed:
  - Consider renaming `HTMLOrSVGElement` to `HTMLOrForeignElement` https://github.com/whatwg/html/issues/4702 [addition/proposal] [needs implementer interest] [needs tests] [integration] 
  - Upcoming WHATNOT meeting on 2026-04-30 https://github.com/whatwg/html/issues/12401 [agenda+] 
  - Meeting 41 for joint OpenUI-WHATWG/HTML-CSSWG task force on styleable form controls https://github.com/whatwg/html/issues/12380 
  - Unexpected behavior of `interestfor` with popover controls https://github.com/whatwg/html/issues/12338 [topic: popover] [topic: button] 

* whatwg/dom (+0/-0/💬1)
  1 issues received 1 new comments:
  - #1463 importNode should allow null customElementRegistry (1 by sorvell)
    https://github.com/whatwg/dom/issues/1463 [needs implementer interest] [addition/proposal] 



Pull requests
-------------
* whatwg/html (+3/-0/💬25)
  3 pull requests submitted:
  - 12416  (by lukewarlow)
    https://github.com/whatwg/html/pull/12416 
  - 12414  (by kbabbitt)
    https://github.com/whatwg/html/pull/12414 
  - 12409  (by anaskim)
    https://github.com/whatwg/html/pull/12409 

  11 pull requests received 25 new comments:
  - #12416 Rename HTMLOrSVGElement mixin to HTMLOrSVGOrMathMLElement (6 by annevk, fred-wang, lukewarlow)
    https://github.com/whatwg/html/pull/12416 
  - #12409 Add platform-provided behaviors for custom elements & submit behavior (1 by keithamus)
    https://github.com/whatwg/html/pull/12409 
  - #12397 Upstream Document Picture-in-Picture API (1 by jan-ivar)
    https://github.com/whatwg/html/pull/12397 
  - #12395 Upstream sanitizer api (2 by noamr)
    https://github.com/whatwg/html/pull/12395 
  - #12353 Pass document's settings object when processing a manifest (2 by dmurph, marcoscaceres)
    https://github.com/whatwg/html/pull/12353 
  - #12345 Simplify popover=hint behaviours & related spec fixes (4 by annevk, jakearchibald, mfreed7)
    https://github.com/whatwg/html/pull/12345 
  - #12205 Make option and optgroup actually disabled inside disabled select (3 by annevk, josepharhar)
    https://github.com/whatwg/html/pull/12205 
  - #12201 Define optgroup base appearance rendering (1 by josepharhar)
    https://github.com/whatwg/html/pull/12201 [normative change] [topic: rendering] [topic: select] 
  - #12008 Skip light dismiss when opening select's picker (1 by josepharhar)
    https://github.com/whatwg/html/pull/12008 
  - #11723 [focusgroup] Add the focusgroup attribute  (2 by janewman, lukewarlow)
    https://github.com/whatwg/html/pull/11723 
  - #11613 Run snapshot post-layout state steps in resizeObserver loop (2 by lilles, tabatkins)
    https://github.com/whatwg/html/pull/11613 [topic: rendering] 


Repositories tracked by this digest:
-----------------------------------
* https://github.com/w3c/html-aam
* https://github.com/w3c/html-aria
* https://github.com/w3c/html-extensions
* https://github.com/w3c/htmlwg
* https://github.com/w3c/webcomponents
* https://github.com/whatwg/html
* https://github.com/whatwg/dom


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Received on Monday, 4 May 2026 17:00:31 UTC