[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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