If you have a look at a CSS file in an enterprise application, for example, the one you're working on now, you'll see how often the same color is noted in it. Standard CSS has no way to define a particular color abstractly for defining as a panel header color, a background color of an active pop-up menu item, a separator color, etc. To define common interface styles, you have to copy the same values over and over again and the more interface elements you have the more copy-and-paste activity that needs to be performed.
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