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When I write
background-color:lightblue;
In IntelliJ, it highlights lightblue and suggests I replace it with #add8e6.
I rather like lightblue, it’s much more readable. Was it “banned” from the specs? Should I do as IntelliJ suggests?
The nearly(*) authorative list of colors supported in CSS3 is listed in the W3C proposed recommendation CSS Color Module Level 3, section 4.1 Basic color keywords.
lightblueis only listed under the Extended color keywords of section 4.3.The non-normative profiles of section 7 suggest that HTML only supports the basic colors, while the extended ones are permitted in SVG.
(*) Nearly because this is a proposed recommendation. It does describe current practice.