Extending native JsTypes from Java with GWT 2.8.0-rc2

Hi everyone!

Are we supposed to be able to extend native (browser) JsTypes from Java? Specifically, having the following declaration (from Elemental2):

@JsType(isNative = true, namespace = JsPackage.GLOBAL)

public class HTMLDivElement extends HTMLElement {...}

and the extending type

public class DummyElement extends HTMLDivElement {...}

I'm getting TypeError: Illegal invocation from the compiled js code when it tries to define the class (com.google.gwt.lang.Runtime.copyObjectProperties (Runtime.java:104)), while copying native properties from the extends js type's prototype. The property in this case is 'align' but it happens on other browser native properties too.

Thanks for the help!

All the best,
Nandi.

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