Support custom elements that contain ':' or '-'

[arciisine]

I am working with tags that contain hyphens or colons (for namespacing), and currently the window.html5.elements, is limited to only elements that match the regex '\w+' (which splits on all punctuation including commas, hyphens and colons) . I would ask that the element unrolling regex match on '[^,]+' (only hitting commas), so it can pick up the colons and hyphens.