[Bug 18738] [Custom]: Specify that type selectors match all derived types

https://www.w3.org/Bugs/Public/show_bug.cgi?id=18738

Dimitri Glazkov <dglazkov@chromium.org> changed:

           What    |Removed                     |Added
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                 CC|                            |bzbarsky@mit.edu

--- Comment #2 from Dimitri Glazkov <dglazkov@chromium.org> ---
I think it was Boris who came up with this.

http://dev.w3.org/csswg/selectors4/#type-selectors

In order for <x-button> (a subclass of HTMLButtonElement) to also match UA
styles for <button>, we redefine "element type" to mean:

1) the element itself -- x-button
2) all types it is inherited from -- button.

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