Re: [w3c/webcomponents] Add <a> to safelist of elements that can call attachShadowRoot (#511)

Hi,  I made a comment over in #110, perhaps that was out of place - sorry for the noise.  I am working on a customized built-in <map> element in Polymer, and it is working quite nicely so far.  I am a bit surprised at the neg on is=".. here.  But mostly, I want to say that I want to provide enhanced behaviour for the <map> and <area> elements, which I guess are related/similar to <a> so I'm adding this comment here.  My element demo can be found here:  http://maps4html.github.io/Web-Map-Custom-Element/ or http://maps4html.github.io/Web-Map-Custom-Element/map-vs-web-map.html or a few other pages in that gh-pages branch.  

If attachShadowRoot is not permitted for these elements, I am thinking that the idea of a customized built-in <map> element is not going to be possible, is that correct? That would be a shame as it takes away a great fallback behaviour that I am looking for - that of the existing <map> and associated <area> elements.

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