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I previously wrote about taking CSS beyond a simple style library by writing HTML that’s easy to style. I’d like to go into one point in a bit more detail – avoiding class explosion by leveraging descendant selectors: You might think that really stylable HTML needs classes all over the place. That's not true, thanks to descendant selectors, which let you target elements inside a parent element. For instance, descendant selectors will let you style all > elements which appear inside a > with and id of "nav":