That's great to hear, really looking forward being able to do more with selects :) I filed https://bugzilla.mozilla.org/show_bug.cgi?id=2009906 for DevTools support, as we need to make sure those new pseudo elements are showing up in the rules view, and possibly in the markup view
On Tuesday, January 6, 2026 at 3:36:06 PM UTC+1 [email protected] wrote: > Summary: > Prototype out the various extensions to select elements, including: > - The `<selectedcontent>` element. > - Relaxing of the parser restrictions & content model for `<select>` > elements. > - Defining `appearance: base-select`, and implementing the UA Stylesheet > and ShadowDOM changes relating to this new mode. > - Defining new pseudo elements such as `::picker(select)`, > `::picker-icon` & `::checkmark`. > - New ARIA mappings. > > Bug: > https://bugzilla.mozilla.org/show_bug.cgi?id=1944403 > > Specification: > Various specifications include this work: > - CSS Forms 1 (https://drafts.csswg.org/css-forms-1/) > - CSS UI 4 (https://drafts.csswg.org/css-ui-4/) > - CSS Pseudo 4 (https://drafts.csswg.org/css-pseudo-4/) > - HTML (https://html.spec.whatwg.org/) > - HTML-AAM (https://w3c.github.io/aria/html-aam/) > > Standards Body: > W3C (WHATWG, CSSWG, ARIAWG) > > Platform coverage: > all. > > Preference: > A variety of feature flags will be implemented so that each facet can be > independently verified and/or shipped, including: > - dom.lift-select-parser-restrictions.enabled (for the new > parser/content model changes) > - dom.selectedcontent.enabled (for the new `<selectecontent>` element) > - layout.css.select-pseudo-elements.enabled (for the new pseudo elements) > > DevTools bug: > N/A > > Link to standards-positions discussion: > https://github.com/mozilla/standards-positions/issues/1060 general > position; positive. > https://github.com/mozilla/standards-positions/issues/1142 for > `<selectedcontent>`. > https://github.com/mozilla/standards-positions/issues/1086 for relaxing > of the parser; positive. > > > Other browsers: > Blink: Positive, shipping. > WebKit: Supportive. > > web-platform-tests: > Many in > https://wpt.fyi/results/html/semantics/forms/the-select-element/customizable-select > > <https://wpt.fyi/results/html/semantics/forms/the-select-element/customizable-select?label=master&label=experimental&aligned> > . > > Myself and other members of the DOM Core team at Mozilla will be > prototyping out these features, which collectively have been called > "Customizable Select". There is a large body of work here, and so we may > work on (or enable in nightly) individual parts (such as lifting the parser > restrictions) while ensuring web compatibility is maintained. > -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/mozilla.org/d/msgid/dev-platform/1a455ed1-f88e-4f82-9da2-a7d8e8f2dc62n%40mozilla.org.
