Tests if the color datatype is supported. There are multiple syntaxes for specifying the same color, such as #37F and #3377FF. For each of the six groups shown here, each of the circles in the group uses one of the syntactical forms
The first row uses five forms - 3-digit hex, 6-digit hex, rbg() integer form, rgb() percentage form, and the 'HTML' subset of the name ('X11') colors.
The second row uses only four forms - 3-digit hex, 6-digit hex, rbg() integer form, rgb() percentage form - as there are no HTML or X11 names for those colors.
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For each of the six groups of circles shown here, all circles must be identical in color, and the same color as in the reference image.