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Relies on #17614
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Source-Repo: https://github.com/servo/servo
Source-Revision: a6739cb17f381b88531eb6173d048868aec8e082
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Initial work for implementing custom element reactions: https://html.spec.whatwg.org/multipage/custom-elements.html#custom-element-reactions
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Source-Repo: https://github.com/servo/servo
Source-Revision: 7b134440fc736450cc87470a78e94f80b9161679
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This implements the CE-related steps when creating elements. `is` is now support by `document.createElement` and is stored on `Element`s. Only synchronously created autonomous elements are supported as async element creation and customized built-in elements both require custom element upgrade reactions.
Spec: https://dom.spec.whatwg.org/#concept-create-element
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Source-Repo: https://github.com/servo/servo
Source-Revision: bc3ec0ce1bc0ea55ac60def8b3e75948c7085162
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spec: https://html.spec.whatwg.org/multipage/#htmlconstructor
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Source-Repo: https://github.com/servo/servo
Source-Revision: c58bcc23ea5c4b5f83944e111ce9a2d0ec2b5400
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Implements https://html.spec.whatwg.org/multipage/#customelementregistry
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Source-Repo: https://github.com/servo/servo
Source-Revision: b584944f1731c71920abf9a03e1f3cd1e790f7c4
