[w3c/webcomponents] Please add <map> to the list of elements that support attachShadow(init) (#734)

When appropriate, would you please consider adding the <map> element to the whitelist of elements which support a shadow root: https://dom.spec.whatwg.org/#dom-element-attachshadow 

<map> is very useful to my project and it would be idea if we could use it as the basis of a custom element.  Thanks for considering this.

![image](https://user-images.githubusercontent.com/2437285/36224848-c8ce3e16-1196-11e8-9ed3-d32131be3dde.png)


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Received on Wednesday, 14 February 2018 19:54:04 UTC