WebStorm doesn't recognize the interface ElementTraversal on HTML elements

Html elements of a web page loaded in any modern browser implement the interface ElementTraversal

interface ElementTraversal
   readonly attribute Element        firstElementChild;
   readonly attribute Element        lastElementChild;
   readonly attribute Element        previousElementSibling;
   readonly attribute Element        nextElementSibling;
   readonly attribute unsigned long  childElementCount;

Why doesn't WebStorm 1.0.1 support it?
see this: http://www.w3.org/TR/ElementTraversal/


No user has asked for it, nor we have not seen its usage in supported JavaScript libraries so far.
Good news that we will support it in WebStorm 1.X, EAP for it will start within couple of weeks.


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