[Webkit-unassigned] [Bug 163147] New: importNode from template doesn't instantiate custom element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163147

            Bug ID: 163147
           Summary: importNode from template doesn't instantiate custom
                    element
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jan at component.kitchen
                CC: cdumez at apple.com

See http://jsbin.com/tukocup/1/edit?html,console.

    class TestElement extends HTMLElement {}
    customElements.define('test-element', TestElement);

    let template = document.createElement('template');
    template.innerHTML = `<test-element></test-element>`;
    let clone = document.importNode(template.content, true);
    let element = clone.querySelector('test-element');
    console.log(element instanceof TestElement); // true in Chrome Canary, false in WebKit

This defines a custom element, then tries to use it in a template. Following the importNode call, the test-element node should be an instance of TestElement, but it's not. (It works as expected in Chrome Canary.)

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