Customizable select element

[josepharhar]

MDN URL

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/select

What specific section or headline is this issue about?

No response

What information was incorrect, unhelpful, or incomplete?

The customizable select feature adds several APIs:

• The ::picker(select) pseudo-element, which applies to <select> elements
• The appearance:base-select CSS property, which applies to <select> and ::picker(select) to change their rendering
• The <selectedcontent> element
• The ::picker-icon pseudo-element, which applies to <select> elements
• The ::checkmark pseudo-element, which applies to <option> elements
• HTML parser changes for <select> (not sure if this behavior is described on MDN)
• The new content model for <select> elements, which allows much more content and gets rendered when appearance:base-select is used

What did you expect to see?

• New pages for the new pseudo-elements, new HTML element, and new CSS property.
• Probably updates for the <select> element page as well.
• Maybe a separate page just for customizable select?

Do you have any supporting links, references, or citations?

• HTML issue, which contains links to spec PRs and explainer: Customizable <select> element whatwg/html#9799
• Chromium intent to ship: https://groups.google.com/a/chromium.org/g/blink-dev/c/kN5LTzuTLVs
• Una's up to date blog post: https://una.im/select-updates/

Do you have anything more you want to share?

The specs are not merged yet but it will be shipped in chrome soon.