X11 (Named Colors) Palette
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X11 Color Palette is an interactive palette containing X11 Colors.

X11 Colors are named CSS color constants. They are supported by all modern browsers.

Clicking on the color entries in the palette will send the color's name and its corresponding RGB hexadecimal value to the text fields, where it can then be copied and pasted directly into your style sheet.

X11 Color Palette

Color information:

See the System Color Palette.