Support is needed for new CSS4 system color keywords: https://drafts.csswg.org/css-color-4/#css-system-colors
New keywords include:
As an FYI, Text has recently been renamed to CanvasText: https://github.com/w3c/csswg-drafts/issues/4465#issuecomment-547994485
@Sam: Is this something we should be tracking now?
*** This bug has been marked as a duplicate of bug 212703 ***