286642 2025-01-28 13:10:31 -0800 Enhanced <select> 2026-04-23 07:35:59 -0700 1 1 1 Unclassified WebKit Forms WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=301859 InRadar P2 Normal --- 301858 299959 300317 300432 301758 301859 301929 313131 1 jarhar webkit-unassigned akeerthi annevk cdumez thorton webkit-bug-importer wenson_hsieh woodlxf00 oldest_to_newest 2090262 0 jarhar 2025-01-28 13:10:31 -0800 Customizable select is a feature update to the select element which contains several parts listed here: https://github.com/whatwg/html/issues/9799 - Relax <select> parser https://bugs.webkit.org/show_bug.cgi?id=283732 - appearance:base for <select> or appearance:base-select - https://drafts.csswg.org/css-ui-4/#base-appearance - https://github.com/whatwg/html/pull/10629 - ::picker(select) pseudo-element https://drafts.csswg.org/css-forms-1/#selectordef-picker - ::picker-icon pseudo-element https://drafts.csswg.org/css-forms-1/#picker-icon-pseudo-element - ::checkmark pseudo-element https://drafts.csswg.org/css-forms-1/#checkmark-element - <selectedcontent> element https://github.com/whatwg/html/pull/10633 - UA stylesheet for base appearance <select> https://github.com/whatwg/html/pull/10670 2091939 1 webkit-bug-importer 2025-02-04 13:11:14 -0800 <rdar://problem/144182883> 2147813 2 annevk 2025-10-02 05:56:59 -0700 Renaming this to better capture how I think about it at least. One thing not mentioned in OP that's also going to be needed is all the various semantic changes to account for the fact that all the elements involved no longer have a parent-child relationship, but instead require traversing the ancestor chain.