What CSS selectors create performance issues on modern browsers?
CSS-101 has a good, albeit general example of how CSS rules are looked up by browsers: http://www.css-101.org/descendan… This details what Christopher describes as “overqualified selectors”. On a per-page basis: • Google PageSpeed plugin also helps identify ‘inefficient’ and ‘very inefficient’ selectors of a page. • Andy Edinborough’s CSS Stress Test examines each CSS selector on a page and grades it against the baseline average. http://andy.edinborough.org/CSS-…
