document.registerElement('foo', {extends: undefined}) fails

[johnjbarton]

In a page with

<polymer-element name="code-mirror" attributes="value mode theme tabSize lineNumbers"></polymer-element>

Try

var XFooPrototype = Object.create(HTMLElement.prototype);
XFooPrototype.createdCallback = function() {
  this.textContent = "I'm an x-foo!";
};
XFooPrototype.foo = function() {
  console.log('foo() called');
};

var XFoo = document.registerElement('polymer-element', {extends: undefined,
  prototype: XFooPrototype
});

The textContent will not update because the createdCallback is never called. Should work or throw.

[dfreedm]

Should be var XFoo = document.registerElement('code-mirror', ... )

[arv]

Should have been fixed by googlearchive/ShadowDOM@4a630bc

[johnjbarton]

could be, i've not updated.