[Webkit-unassigned] [Bug 195403] New: Customized built-in elements aren't supported

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Mar 7 00:25:42 PST 2019


https://bugs.webkit.org/show_bug.cgi?id=195403

            Bug ID: 195403
           Summary: Customized built-in elements aren't supported
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Major
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andreas.deuschlinger at gmail.com

The HTML Living Standard for Custom Elements specifies support to extend existing built-in elements, by:
- the `is="my-button"` attribute
  https://html.spec.whatwg.org/multipage/custom-elements.html#attr-is
- the `document.createElement('button', { is: 'my-button' })` second argument
  https://dom.spec.whatwg.org/#dom-elementcreationoptions-is

Example:
https://html.spec.whatwg.org/multipage/custom-elements.html#custom-elements-customized-builtin-example

The Webkit Status page gives incorrect information claiming that Custom Elements V1 are supported,
though in fact only "autonomous custom elements" are supported.
https://webkit.org/status/#feature-custom-elements

Caniuse informs about this incomplete implementation correctly:
https://caniuse.com/#feat=custom-elementsv1

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