JavaScript Web components: inheriting from DOM prototypes inheriting components in angular

One part of the currently developed Web Components specification is that one will be able to create one's own HTML element, e.g. by calling the new document.register. An example is given here: https://github.com/mozilla/web-components/blob/master/demo/demo.html

As one can see, a new x-bar element is created by having its prototype being inherited from the prototype of an HTML span element.

Now I tried the following in Firefox Nightly (with document.register support, by the way):

var x = Object.create(HTMLInputElement.prototype);

I have been thinking that this would be the first step in extending/customizing the behaviour or look of an ordinary input element.

However, when I run something like x.value, the browser's Javascript engine throws a TypeError: Value does not implement interface HTMLInputElement.

Now I am a bit stuck. Is it a limitation of the current implementation or the specification?

Answer:1

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