I mean you are right, but there are certainly selectors which are "faster" just the faster part is more on the 0.000001ms level than any measurable level. Also

I mean you are right, but there are certainly selectors which are "faster" just the faster part is more on the 0.000001ms level than any measurable level. Also I am fairly certain (been a while since I spent time in Webkit source) but class name and attribute selectors are implemented the same, if you want to do a proper benchmark you would want to do id, nested selectors, attributes, class, etc. And at that level you will find a significant difference.