Contact emailsjar...@chromium.org

Explainerhttps://open-ui.org/components/customizableselect

Specificationhttps://github.com/whatwg/html/pull/10557

Summary

This change makes the HTML parser allow additional tags in <select> besides
<option>, <optgroup>, and <hr>. This change is in support of the
customizable <select> feature but is being shipped first because it can be
done separately and has some compat risk which I'd like to get feedback on.
Customizable select explainer:
https://open-ui.org/components/customizableselect/ I did a compat analysis
and determined that the vast majority of sites which would see the effects
of the parser changes would not have their behavior changed. More details
here: https://github.com/whatwg/html/issues/10310 If there are major issues
with this change, I will reassess and make adjustments to the parser as
needed.


Blink componentBlink>HTML>Parser
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EHTML%3EParser>

TAG reviewNone

TAG review statusPending

Risks


Interoperability and Compatibility

I believe there is low interop risk because other vendors are reviewing the
proposal in WHATWG and are not objected to changing the parser behavior
here. There is a compat risk if websites are relying on the old parser
behavior. As I mentioned in the main description, I have done an analysis
and based on the websites I have investigated I believe there is low risk.
If we encounter issues then I will adjust the parser as needed.


*Gecko*: Positive of experimenting:
https://github.com/whatwg/html/issues/10310#issuecomment-2189178702

*WebKit*: No signal (
https://github.com/WebKit/standards-positions/issues/414)

*Web developers*: No signals (
https://github.com/mozilla/standards-positions/issues/1086)

*Other signals*:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that
it has potentially high risk for Android WebView-based applications?

None


Debuggability

None


Will this feature be supported on all six Blink platforms (Windows, Mac,
Linux, ChromeOS, Android, and Android WebView)?Yes

Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes

Flag name on chrome://flagsSelectParserRelaxation

Finch feature nameSelectParserRelaxation

Requires code in //chrome?False

Tracking bughttps://crbug.com/335456114

Estimated milestones
Shipping on desktop 130
DevTrial on desktop 128
Shipping on Android 130
DevTrial on Android 128
Shipping on WebView 130

Anticipated spec changes

Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github issues
in the project for the feature specification) whose resolution may
introduce web compat/interop risk (e.g., changing to naming or structure of
the API in a non-backward-compatible way).
None

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5145948356083712?gate=5114873999261696

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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