d3.color(specifier)
Parses the specified CSS Color Module Level 3 specifier string, returning an RGB or HSL color. If the specifier was not valid, null is returned. Some examples:
rgb(255, 255, 255) rgb(10%, 20%, 30%) rgba(255, 255, 255, 0.4) rgba(10%, 20%, 30%, 0.4) hsl(120, 50%, 20%) hsla(120, 50%, 20%, 0.4) #ffeeaa #fea steelblue
The list of supported named colors is specified by CSS.
Note: this function may also be used with instanceof to test if an object is a color instance. The same