There is no problem with empty <b> and <i> tags which, by the way, are NO LONGER DEPRECATED in HTML5. (Learn the standards before becoming a standards Nazi.) A

There is no problem with empty <b> and <i> tags which, by the way, are NO LONGER DEPRECATED in HTML5. (Learn the standards before becoming a standards Nazi.) And anyway, guess what? This was, as you say, a proof of concept. It would work with different elements, or even pseudo-clases (and pseudo-classes in pseudo-classes), though then IE compatibility would be lost. Anyone who copy/pastes this without changing the CSS selectors (styling all <b> tags as if they were triangles) clearly misses the point, you know?