What do the different colored highlights in Sublime Text 2 indicate?

I am facing an issue with the code in a particular file:

background: -moz-linear-gradient(red, orange, yellow, green, blue, indigo, violet);

Interestingly, Sublime Text 2 appears to highlight the background of indigo and violet with a light blue color:

https://i.sstatic.net/aNUaN.png

Upon further exploration, I found that colors like chocolate, aliceblue, pink are highlighted, but others like maroon, teal, silver are not.

I am curious to know the significance of this blue highlighting. What does it signify?

csscolorsbackgroundsublimetext2highlight

Answer №1

The list provided includes "Extended color keywords"

Popular browsers support X11 colors [X11COLORS] with the addition of gray/grey variants from SVG 1.0, resulting in a list identical to the SVG 1.0 color keyword names. This extension goes beyond SVG's definitions.

A glimpse into CSS.tmLanguage:

...
<dict>
<key>color-values</key>
<dict>
    <key>patterns</key>
    <array>
        ...
        <dict>
            <key>comment</key>
            <string>Mostly recognized colors but may not validate. Reference: http://www.w3schools.com/css/css_colornames.asp</string>
            <key>match</key>
            <string>\b(aliceblue|antiquewhite|aquamarine|azure|beige|bisque|blanchedalmond|blueviolet|brown|burlywood|cadetblue|chartreuse|chocolate|coral|cornflowerblue|cornsilk|crimson|cyan|darkblue|darkcyan|darkgoldenrod|darkgray|darkgreen|darkgrey|darkkhaki|darkmagenta|darkolivegreen|darkorange|darkorchid|darkred|darksalmon|darkseagreen|darkslateblue|darkslategray|darkslategrey|darkturquoise|darkviolet|deeppink|deepskyblue|dimgray|dimgrey|dodgerblue|firebrick|floralwhite|forestgreen|gainsboro|ghostwhit...

...

The visual difference is due to scoping:

support.constant.color.w3c-standard-color-name.css (for standard color keywords)
invalid.deprecated.color.w3c-non-standard-color-name.css (for extended color keywords)

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