[Webkit-unassigned] [Bug 255433] New: Accessibility is not informed of changes to several attributes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255433

            Bug ID: 255433
           Summary: Accessibility is not informed of changes to several
                    attributes
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            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

Accessibility relies on attribute changes from the DOM to stay up to date, and we are missing quite a few. This is because accessibility is notified about attribute changes in Element::attributeChanged. However, this method is virtual, and many subclasses don't call up to Element::attributeChanged. I believe we've always had this problem for some attributes, but it was worsened with the restructuring in this change:

https://bugs.webkit.org/show_bug.cgi?id=255258 (Drop Element::parseAttribute())

After this change, we stopped receiving updates for the disabled attribute for option elements, the placeholder attribute for HTMLTextFormControlElement subclasses, and likely more.

This was caught because accessibility/dynamic-attribute-changes-should-update-isenabled.html started failing in isolated tree mode (--accessibility-isolated-tree test runner flag). This configuration is not in EWS (post-commit only for now), so it couldn't have been caught up-front.

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