Re: [webcomponents] [Issue #110] Have a white list for attachShadow (ada4804)

Currently it looks like regular block element with special styling applied and it behaves so in Chromium right now, so I've added `icon` attribute for instance and have icon added to button when I need it with simple attribute.
There is `-webkit-appearance: button;`, but no User Agent Shadow Root (like in `input` or `textarea`) to have problems with.
Are there any other issues I'm not aware about?

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