Draft: HTML5.3 Implementation Report

This report outlines known implementations for the features added between HTML5.2 and HTML5.3. It is intended to demonstrate sufficient interoperability to justify moving HTML5.3 from Candidate Recommendation as required by W3C Process.

After that time it is unlikely to be updated, and people interested in the support of HTML features should instead look at the many resources on the Web that try to provide that information in an up-to-date form.

Last updated: 11 September 2018.

Implementation information is documented in the relevant GitHub issue, Pull Request (PR), or documentation for developers.

Added

	Blink (e.g. Chrome/Opera/Yandex/Vivaldi)	Edge/EdgeHTML	Firefox/Quantum	Internet Explorer/Trident	Safari/Webkit	Notes
Link to pull request, feature...	?	?	?	?	?	Notes/tests/...
Added `autocapitalize` attribute	Pass	?	Fail	?	Pass	Terence
Added the `as` attribute	Pass	fail	Pass	?	fail	Xiaoqian
Added `allowUserMedia` attribute to `iframe`	pass	fail	fail	fail	fail	will be replaced by feature policy
Added the `ping` attribute	Pass	Pass	Pass	Fail	Pass
Added the `integrity` attribute from Sub-Resource Integrity	pass	pass	pass	?	pass	Xiaoqian
Added `disableRemotePlayback` to `HTMLMediaElement` interface	pass	fail	fail	?	fail	Xiaoqian
Added allowable context types for the `canvas` element	Pass	?	Pass	?	?	Terence
Added fully internationalized email addresses	?	?	Pass	?	?	Chaals
Added `focusin` and `focusout` events	?	?	?	?	?	Patricia
Added missing `rel` definitions	?	?	?	?	?	Bruce
Added MacOS uniform type identifier for `media-type` registrations	--	--	--	--	--	up to date with developer.apple.com
Added mandate for UTF-8	Pass	?	Pass	?	Pass
Added Window clipboard format for `media-type` registration	--	--	--	--	--	up to date with MSDN	Terence
Defines the `rev` IDL attribute	Pass	Pass	Pass	Pass	?	Chaals
Added customised built-in elements	Pass	Fail	Pass	Fail	?	Chaals
Added autonomous custom elements	Pass	Fail	Pass	Fail	?	Chaals
add `customElements` property to the `Window` Object	Pass	?	Pass	?	?	Tested manually with the console
`caption` end tag is not required	Pass	Pass	Pass	Pass	?	Chaals
Adds `capture` attribute	Pass	Fail	Pass	Fail	Pass	tink
Only select a browsing context by name from within the unit of related browsing contexts	?	?	?	?	?	chaals
Add decode() and decoding to HTMLImageElement	Pass	?	Fail	Fail	Pass	Sangwhan
Make HTMLMediaElement.play() return a Promise	Pass	?	Pass	?	Pass	Sangwhan

Removed

	Blink (e.g. Chrome/Opera/Yandex/Vivaldi)	Edge/EdgeHTML	Firefox/Quantum	Internet Explorer/Trident	Safari/Webkit	Notes
Deprecate object from forms	Pass	?	Pass	?	pass	Manual testing in Firefox, Chrome and Safari showed that `object` was associating to `form` elements by use of `form` attribute. Prose updated to indicate this is still valid for historical reasons.
Removed `anchor-points` `section`	Fail	Fail	Fail	Fail	Fail	No known implementations. Tested manually.
Removed magic alignment for the `dialog` element	Fail	Fail	Fail	Fail	Fail	No known implementations. Tested manually.
Removed requirement for XML `srcdoc` in xHTML	Pass	?	Pass	?	?	Chaals
Removed "monkeypatch" for File API	-	-	-	-	-	removed from spec due to resolution of w3c/FileAPI#32 and updated specification defined in FileAPI.

Other

	Chrome/Blink	Edge/EdgeHTML	Firefox/Quantum	Internet Explorer/Trident	Safari/Webkit	Notes
Clarified that the doctype is ignored for `srcdoc`	?	?	?	?	?	Patricia
Hides `nonce` attribute	pass	fail	fail	?	fail	Xiaoqian
loosen the rule of the rb element	pass	?	pass	?	pass	Xiaoqian