Update spec to reflect <select> no longer being an element with default preferred size

[sakupi01]

Summary

Following the resolution in w3c/csswg-drafts#11879, <select> will no longer be an element with default preferred size. This change requires updates to relevant CSS specifications to maintain consistency.

Affected Specifications

CSS Box Sizing Module Level 3

In 5.2.2 Compressible Replaced Elements, <select> is explicitly listed among elements that are "considered to be replaced elements for the purpose of the percentage-sized replaced element rule" and "can have their min-content contribution compressed".

Given that <select> will now have field-sizing: content !important applied in the UA stylesheet as per the HTML spec changes, it should either:

• Be removed from this list, or
• Have a note added to clarify its special behavior

Current spec says:

• select, textarea, progress, meter, marquee.

(optional) CSS Basic User Interface Module Level 4

While section 7.3 "Switching form control sizing: the field-sizing property" does not explicitly mention <select> in its examples of elements with default preferred size, it may be worthwhile to add a clarifying note that <select> is no longer in this category.

Related Changes

• Upcoming HTML spec change: Add UA stylesheet for <select> base appearance by josepharhar · Pull Request #10670 · whatwg/html
• Filed HTML spec update: Remove support of field-sizing from <select> · Issue #11194 · whatwg/html

[lukewarlow]

As mentioned on the HTML issue, it's only forced to content for the base appearance mode. So I'm not sure if it needs updating?