Imagine having a popup element labeled as "popup" with two buttons inside, one positioned on the left and the other on the right side, both having the class "popupbutton". Which CSS rule would be the most optimal in this scenario?
#popup a.popupbutton
#popup .popupbutton
a.popupbutton
.popupbutton
.popupbutton
Opting for the class will result in quicker performance. However, the time saved is minimal, around 20-50ms, which may or may not be significant depending on the context.
A comprehensive test comparing CSS selector speeds across various browsers can be found here:
On average, there is a 50ms slowdown across all browsers, and for major ones like IE 6 & 7, FF3, the average difference is just 20ms. Enhancing CSS selectors would only bring about a 20ms improvement for 70% or more of current users.
As demonstrated in the article, the variance in selector speed is minimal even in tests involving complex DOM scenarios.
.popupbutton has been identified as the optimal selector for speed. For more information, refer to Google's PageSpeed tips on maximizing CSS rendering efficiency.
.popupbutton holds the title for the quickest method.
It's important to remember that a.popupbutton differs from .popupbutton. While they often produce the same results, there is an exception to consider:
a:link { color: red; }
.popupbutton { color: green; } /* This won't have an effect */
a.popupbutton { color: green; } /* This will be effective */
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