[Webkit-unassigned] [Bug 150225] Prototype custom element API

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150225

--- Comment #2 from Ryosuke Niwa <rniwa at webkit.org> ---
Created attachment 263360
  --> https://bugs.webkit.org/attachment.cgi?id=263360&action=review
Basic support for document.defineCustomElement

This WIP patch does the following:
- Added document.defineCustomElement(DOMString, CustomElementInterface)
- document.createElement support a custom element name
- HTMLElement constructible via custom element

With this, the following code does something useful:

class MyElement extends HTMLElement {
    constructor() {
        super('my-element');
        return this;
    }
}

document.defineCustomElement('my-element', MyElement);

new MyElement;
document.createElement('my-element');

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