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Re:Classes? Where We’re Going, We Don’t Need Classes (CSS) by tangue on Tuesday June 19, 2012 @10:36AM (#4132015)
Exactly. I'll just add that css selectors are inefficient in terms of performance (see https://developer.mozilla.org/en/Writing_Efficient_CSS ).

And really it would be better to avoid references to linguistics when talking about a markup language, especially references from early structuralism which, basically, has failed.

Re:Classes? Where We’re Going, We Don’t Need Classes (CSS) by lazerwalker on Tuesday June 19, 2012 @11:00AM (#4132137)
While that Mozilla page is completely accurate, it's very rare that your CSS is your site's performance bottleneck. The vast majority of the time you're better off making your structural CSS choices based on developer maintainability, not prematurely optimizing rendering performance.