[Webkit-unassigned] [Bug 197960] New: Custom elements: implement ElementInternals/disabledFeatures/element.attachInternals()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197960

            Bug ID: 197960
           Summary: Custom elements: implement
                    ElementInternals/disabledFeatures/element.attachIntern
                    als()
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d at domenic.me

Spec:

- Some steps of https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-define for disabledFeatures
- Step 3 of https://dom.spec.whatwg.org/#dom-element-attachshadow for disabledFeatures = ['shadow'] specifically
- https://html.spec.whatwg.org/multipage/custom-elements.html#the-elementinternals-interface for attachInternals() and the (empty-for-now) ElementInternals class

Tests:

- https://github.com/web-platform-tests/wpt/blob/master/shadow-dom/Element-interface-attachShadow-custom-element.html
- https://github.com/web-platform-tests/wpt/blob/master/custom-elements/HTMLElement-attachInternals.html

A separate bug will be filed for form-associated custom elements, which will make ElementInternals not empty. But this seems like a separable chunk of work.

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