[Webkit-unassigned] [Bug 157323] New: Implement <details>/<summary> disclosure triangle as a list item with ::marker

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157323

            Bug ID: 157323
           Summary: Implement <details>/<summary> disclosure triangle as a
                    list item with ::marker
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dbaron at dbaron.org
                CC: simon.fraser at apple.com

Following https://github.com/whatwg/html/issues/722 , HTML now defines styling of the disclosure triangle of <summary> by making <summary> a list-item, and allowing it to be styled with list-style-* and (in the future, when it's supported) ::marker.

WebKit currently supports ::-webkit-details-marker for styling the <summary>'s triangle, but does not make it a list-item or support the list-style-* properties.  It should do so to match the update to the spec.

Gecko is planning to ship support for <summary> doing it as described in the spec (see https://bugzilla.mozilla.org/show_bug.cgi?id=1226455).  The Chromium bug on switching to the spec's behavior is https://bugs.chromium.org/p/chromium/issues/detail?id=590014 .

See the test page at https://bug1226455.bmoattachments.org/attachment.cgi?id=8747989

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