Re: [webcomponents] [Custom]: Add the possibility to extend the custom element (bugzilla: 26583) (#201)

In general I do think it's a bit weird that type extensions rely on a lot of the same constraints and infrastructure as custom tags, when there's no real reason to do so. E.g. maybe in my ideal world you'd have `customElements.define("custom-tag", CustomTag)` and `customElements.defineExtension("button", "plastic", PlasticButton)`, instead of lumping them both together with `customElements.define("custom-name", CustomTag, { extends: "button" })`. But I'm not sure it's worth the churn. Especially since there's a weak argument that the hyphen encourages namespacing, anyway.

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