[Webkit-unassigned] [Bug 148780] New: MutationObserver doesn't add a record when classList.add/remove is a no-op

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148780

            Bug ID: 148780
           Summary: MutationObserver doesn't add a record when
                    classList.add/remove is a no-op
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rniwa at webkit.org
                CC: benjamin at webkit.org, cdumez at apple.com, sam at webkit.org,
                    webkit-bug-importer at group.apple.com

MutationObserver should be getting new records on classList.add/remove even if they're no-op.

See https://dom.spec.whatwg.org/#concept-DTL-update

Firefox adds the records as expected by the spec.

This bug was found by the newly added test: LayoutTests/http/tests/w3c/dom/nodes/MutationObserver-attributes.html

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