Move HTMLOrForeignElement out of HTMLElement?

[bershanskiy]

HTMLOrForeignElement is a mixin that describes several features common to the HTMLElement, SVGElement and MathMLElement interfaces. It even has it's own page (HTMLOrForeignElement)and its members are documented on pages that are children pages to that page. Yet, for some reason __compat data about members of HTMLOrForeignElement lives under corresponding elements.

We should consider either of the two things:

1. Create a single separate file api/HTMLOrForeignElement.json
HTMLOrForeignElement.dataset says "Please change the compat macro's paramter to api.HTMLOrForeignElement.dataset after BCD is updated."
2. Create separate BCD entries for HTMLElement, SVGElement and MathMLElement but make a single documentation page
   E.g., for HTMLOrForeignElement.nonce each of HTMLElement.nonce, SVGElement.nonce, and MathMLElement.nonce will have a separate __compat like they do now, but they will link to a single article HTMLOrForeignElement.nonce.

[Elchi3]

This is tricky and we haven't addressed this issue. See #472 and #3463 for some prior discussions.

[bershanskiy]

Thanks. Closing this as a duplicate of the linked bugs.