Eliminate nameToHex dictionary lookup by using CSS instead

It looks like setting a color by name to some DOM element and retrieving it returns it in a sensible format (rgb(255,255,255) in Chrome). I need to check how that performs cross-browser. Overall this seems like a good idea, though.

Locate the nameToHex dictionary and inspect how named colors are currently converted. Research whether assigning a named color to a DOM element and reading its computed value is consistent across the supported browsers; done means the lookup can be removed without changing color results.

Written by the indexing model from the issue text.