Parse a CSS colour in the forms a theme uses: #rgb, #rgba, #rrggbb,
#rrggbbaa, rgb() and rgba(). Anything else (a named colour, hsl())
is returned as null, and the caller falls back to a sensible neutral rather
than throwing: a theme with one exotic colour should still get chrome.
Parse a CSS colour in the forms a theme uses:
#rgb,#rgba,#rrggbb,#rrggbbaa,rgb()andrgba(). Anything else (a named colour,hsl()) is returned as null, and the caller falls back to a sensible neutral rather than throwing: a theme with one exotic colour should still get chrome.