[Webkit-unassigned] [Bug 275211] New: support ::details-content pseudo-class and improved styling of <details> element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275211

            Bug ID: 275211
           Summary: support ::details-content pseudo-class and improved
                    styling of <details> element
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dbaron at dbaron.org

https://github.com/whatwg/html/pull/10265 is proposing changes to specify the rendering of the <details> element in more detail.  (See also https://github.com/WebKit/standards-positions/issues/351 .)

Some of these changes match existing implementations.  However, I'm aware of a number of things that would need to change in WebKit to match these changes:
* the existing changes in bug 157323 and bug 228843 would be needed to match what is already in the HTML spec
* the display property would need to be allowed to change more generally on both the <details> and also (I think) <summary> elements
* the ::details-content pseudo-element specified in https://drafts.csswg.org/css-pseudo-4/#details-content-pseudo would need to be implemented and made to match the correct element. (There may be some work here to implement the "part-like pseudo-element" concept.)
* the default display of the internal <slot> matched by the ::details-content pseudo-element would need to change to block rather than contents. (This is the one part here that involves compatibility risk, and it's possible we may need to revert this piece.)

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