[Webkit-unassigned] [Bug 245502] New: Consider implementing a UA-level-only pseudo-class matching <select> as a listbox

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245502

            Bug ID: 245502
           Summary: Consider implementing a UA-level-only pseudo-class
                    matching <select> as a listbox
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon at bocoup.com

In https://bugs.webkit.org/show_bug.cgi?id=220376 WebKit's UA stylesheet was tweaked to avoid mismatches between which <select> elements the UA stylesheet styles as a listbox and what the rendering engine decides is a listbox based on the rules specified in the HTML standard. But there's still a mismatch, for example if there's trailing whitespace or an infinite number of other attribute values that are parsed one way or the other for the size="" attribute.

Chromium and Gecko instead support a UA-level-only pseudo-class that matches <select> elements that are listboxes, which solves the mismatch problem.

In https://github.com/w3c/csswg-drafts/issues/7422 it's proposed that such a pseudo-class should be standardized and also exposed to author-level CSS, but the CSS WG is hesitant to standardize it because there are already many pseudo-classes and it's not clear if it solves a common problem for web developers.

Nevertheless, I think a UA-level-only pseudo-class makes sense, and would improve WebKit's <select> rendering interop with Chromium and Gecko.

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