x3d-canvas xmlns attribute handling about x_ite HOT 3 CLOSED

1. It is not possible to add a xmlns attribute to the x3d-canvas element, because it uses the custom-element API from JavaScript. When adding the attribute the API does not recognize the element anymore.
2. I think, the right place for the xmlns attribute is the X3D element inside. Because the x3d-canvas element is still HTML and not part of the namespace, and X3D, what the namespace includes, starts with X3D root element.

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It is ok to not recognize and ignore the xmlns namespaced x3d-canvas element. And this is what happens if this is the only x3d-canvas element on the page.

But I believe, it should not have effects on other x3d-canvas elements on the same page if there are multiple. It is not a critical issue since it would be very rare that somebody would try do that.

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That's right, there must not be an exception. Now, X_ITE silently ignores such elements.

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