1310681 - css-color-4 devtools support about demos HOT 2 CLOSED

Here is the list of changes from css color level 3, as described on https://www.w3.org/TR/css-color-4/#changes-from-3

• rgb() and rgba() functions now accept rather than .
• hsl() and hsla() functions now accept as well as for hues.
• All uses of now accept as well as .
• 4 and 8-digit hex colors have been added, to specify transparency.
• gray() function, for specifying grays compactly. (And maybe allowing specification via luminance.)
• hwb() function, for specifying colors in the HWB notation.
• color-mod() function, for manipulating colors.
• lab() and lch functions, for device-independent color
• color() function and profile at-rule, for profiled device-dependent color.
• device-cmyk() function, for specifying uncalibrated colors in an output-device-specific CMYK colorspace.
• Addition of named color rebeccapurple.

I don't know how many of those have been implemented in the platform yet and are aimed to be supported by devtools in bug 1310681.

from demos.

All css-color-4 rgb, hsl color function changes are already in gecko. I will try speed up the bug 1310681.

Please reference these following link:
https://www.w3.org/TR/css-color-4/#rgb-functions
https://www.w3.org/TR/css-color-4/#the-hsl-notation

from demos.