[Webkit-unassigned] [Bug 283578] New: AX: REGRESSION(286869 at main): AXPropertyName::IsExpanded becomes stale for details and summary elements, causing accessibility/mac/details-summary.html to fail in ITM

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=283578

            Bug ID: 283578
           Summary: AX: REGRESSION(286869 at main):
                    AXPropertyName::IsExpanded becomes stale for details
                    and summary elements, causing
                    accessibility/mac/details-summary.html to fail in ITM
           Product: WebKit
           Version: Safari 18
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tyler_w at apple.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

Prior to https://commits.webkit.org/286869@main, we used to get away with not updating this property because every time the details were expanded, we would throw away the entire details, summary, and other descendant objects and create new ones (because the DOM implementation destroyed and recreated the DOM elements each time). After https://commits.webkit.org/286869@main, the DOM implementation no longer destroys and recreates brand new DOM elements, instead managing the visibility via CSS content-visibility. This a good change, since we now do significantly less work, but need to make sure this property stays up-to-date.

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