whatwg/html

These changes are in line with all three browsers. Chrome still diverges significantly from the standard & tests though on other aspects.

Tests: web-platform-tests/wpt#19298.

Fixes #1055, fixes #4475. #4476 remains outstanding.

These were rather specific for something that HTML does not specify generally. And also resulted in confusion: mathml-refresh/mathml#145.

Other standards load some of these resources using CORS.

This may help with whatwg/whatwg.org#253.

BigInt is part of JavaScript now and no longer a proposal.

Fixes #4947.

As explained at w3c/webcomponents#839 the current setup is insecure.

Tests are now marked as "tentative": web-platform-tests/wpt#16734.

This reverts db03474.

For when the current request is not available or it doesn't have an intrinsic ratio (such as some SVG content).

This specifies the proposal in WICG/intrinsicsize-attribute#16, which is implemented in both Firefox and Chromium behind a flag.

Tests: https://github.com/web-platform-tests/wpt/blob/a57ec1432f22ac42e8e219a32e2abd7c0baa5b09/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/img-aspect-ratio.tentative.html.

Fixes whatwg/html-build#97 in combination with whatwg/wattsi#98.

Closes #4653.

Fixes #4911.

Define "focusable" more concretely, and as part of it, define special
types of focusability: click focusable and sequentially focusable.

As part of this, remove the "tabindex focus flag" because it can be
replaced with "focusable" and "focusable area", and was very confusing.

Part of #4607. Helps provide a basis for further work on #2013, but does
not directly contribute to any shadow DOM upstreaming.

This does not introduce any normative changes, but instead brings into
the spec behavior that was previously only in implementations, and makes
certain concepts explicit.

This defines an explicit list for the document's "sequential focus
navigation order", whose contents are defined to include elements in
shadow trees. Previously the contents of the sequential focus navigation
order were defined mostly implicitly, in the tabindex section.

This also expands the ordering requirements for sequential focus
navigation order to account for shadow trees and slotted elements.

Finally, this has a minor connection to delegatesFocus, in that it
excludes elements that are shadow hosts with delegatesFocus = true from
being focusable areas.

Part of #2013.

Tests: web-platform-tests/wpt#17523

Part of #2013. Note that the delegates focus flag is not consulted.

Tests: web-platform-tests/wpt#17493

This updates all the constructors in the standard for recent changes to
Web IDL. In particular:

* Replace [Constructor] extended attributes with constructor operations
* Cross-links constructor operations on events to the DOM event
  constructor definition
* Changes [HTMLConstructor] to apply to constructor operations, instead
  of to interfaces, and updates all usages of it
* Changes the definition of [HTMLConstructor] to leverage new Web IDL
  concepts of "usual constructor steps" and "internally create a new
  object implementing the interface"

Fixes #4870. Fixes #4890.

This matches implementations.

Tests: web-platform-tests/wpt#17572

Fixes part of #3487; what remains is to add it to ShadowRoot.

Closes #4888. f4e2907 refactored these
steps to remove the task as part of step 2, so step 7 is no longer
needed.

Closes #4879.

Previously, the spec vaguely noted that all agents and agent clusters
must be allocated at the appropriate time.

With this change, similar-origin window agents are allocated
imperatively during document and browsing context creation, along with
their corresponding agent clusters. The agent clusters are stored in the
appropriate browsing context group, via a map keyed by scheme and
registrable domain.

Fixes #4361. Further work on imperative agent/agent cluster allocation,
specifically for workers and worklets, is tracked in #4339.

* Run focusing steps after an animation frame
* Don't autofocus if the top-level document has focused area
* Don't autofocus if one of ancestor document has a :target element

Fixes #3551.  Fixes #4645.

* Add 'autofocus' to the global attribute list
* Move 'autofocus' IDL attribute from HTMLButtonElement, HTMLInputElement,
  HTMLSelectElement, HTMLTextAreaElement to HTMLOrSVGElement

Fixes #4563.

For semantics of something being empty (table cells in this case) we should only consider ASCII whitespace, as we do elsewhere.

Fixes #4854.

This behavior for text-transform has been implemented by many user agents and supported by
web developers via various "CSS normalizing" libraries.

Also align with WebKit and Blink on resetting other properties in the UA stylesheet, and align with WebKit/Blink/Gecko with having text-align: center on buttons.

Fixes #1310, fixes #4676.

Tests: web-platform-tests/wpt#17152

Closes #4863.

Closes #4815.

Part of #1583.

* Use the new tc39.es URLs instead of tc39.github.io.
* Reference ECMA-262 for dynamic import, instead of the separate
  import() proposal.
* Move the requirement about implementing ECMAScript
  Internationalization API down to be a sibling of other related repos.

This matches all implementations. Fixes #4855.

This is another tweak on top of 15cf23a
and 7ce0b47.

Fixes #3014

It seems this feature got added without an agreed upon plan. Firefox fires the loadstart event, but I cannot find evidence of the other events or them using the correct class.

Tests: web-platform-tests/wpt#18499.

Closes #1915. Closes #3860.

This aligns the HTML Standard with Chrome and Firefox rather than Safari.

Tests: web-platform-tests/wpt#18536.

Fixes #4762.

Fixes #4358. See also #2382.

Further code inspection and test-writing revealed that SVG <a> elements
get a 0 default tabIndex in all engines, and <object> elements get a 0
default tabIndex in Blink and WebKit. These were omitted in
15cf23a.

Previously, sandboxed navigation did not prevent navigation via the history API;
the check for the navigation was after the unload steps of the history
traversal. This adds an explicit check in those methods to prevent such
navigation.

Fixes #880.

Fixes #4798.