Like mElements in nsHTMLFormElement, we can have a specific class for mElements in nsHTMLFieldSetElement. So, we could mark elements in mElements if they are "direct descendants" (thus, removing mDirectElements). In addition, it might let us remove nsIMutationObserver from nsHTMLFieldSetElement.
https://bugzilla.mozilla.org/show_bug.cgi?id=1472046 Move all DOM bugs that haven't been updated in more than 3 years and has no one currently assigned to P5. If you have questions, please contact :mdaly.
Priority: -- → P5
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