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add CSS Extensions meant for renaming #2372
I'm thinking of rewriting my long stylesheets to make them more concise using CSS Extensions. The term "CSS Extensions" has two meanings, for both proprietary extensions to CSS, such as -moz-* properties, and those described in https://drafts.csswg.org/css-extensions/, which is partly for letting a "repeatedly-used value . . . be given a short, memorable name instead". I want to use the latter kind of CSS Extensions if most of the modern browsers will use them. Please add reports of support for the latter meaning of CSS Extensions.