Spec: https://html.spec.whatwg.org/C/#dom-attachinternals
Now ElementInternals doesn't work with customized built-in elements because of the first step of attachInternals().
- If element's is value is not null, then throw a "NotSupportedError" DOMException.
We can't support Custom State Pseudo Class for customized built-in elements because of this restriction.
Proposal: Remove the step 1.
We need to triage all of IDL attributes/operations of ElementInternals.
Attributes/operations for Form-associated custom elements
Add "Throw "NotSupportedError" DOMException if target element's "is" value is not null." to them
Default focus behavior ElementInternals: Add a capability to set the default focus behavior #5120
Ditto?
Default accessibility semantics for custom elements Allow setting default accessibility semantics for custom elements #4658
I'm not sure if the current PR is reasonable for customized built-in elements. @domenic ?
Custom State Pseudo Class
It should work with customized build-in elements. We need to remove 'autonomous' from the specification.
WebReflection, MaxArt2501, hudson-newey, MichaelTheriot, denis-migdal and 1 moreWebReflectionWebReflection, aaronanderson and edwardgalligan
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