Generally, SEM is concerned with high level CSS philosophy whereas BIO is an actual technique to help you write better CSS to achieve SEM. The main purpose of both SEM and BIO is to better handle theCSS specificitywhich is one of the most important concepts you should understand for CSS. C...
This is actually based off of https://github.com/w3c/web-platform-tests/blob/master/css/CSS2/selectors/first-letter-punctuation-173.xht, but with combining characters added. Since the combining characters act upon the punctuation and the first letter itself in this test, it is possible that ...
The question was whether you do that or just write out the whole selector instead, as you would with vanilla CSS. Brad’s post gets into all the pro’s and con’s of both ways. To me, I’m firmly in the camp of not “nesting” because it makes searching for selectors so much ha...