This list now includes `MathMLElement` as of bug 1571487, where it was decided to be internally consistent and defer to this bug.
Bug 1586020 Comment 2 Edit History
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This list now includes [`MathMLElement`](https://searchfox.org/mozilla-central/source/dom/webidl/MathMLElement.webidl) as of bug 1571487, where it was decided to be internally consistent and defer to this bug.