How to force ie8 to repaint after adding a class to a dom element

Question

In ie8 if elements don\'t \'repaint\' with the associated css when you change the classname, how can you force the browser to refresh and not kill ie8 performance?

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Answer 1

The correct answer to this question is that you need to actually change the content rule.

.black-element:before { content:"Hey!"; color: #000;}
.red-element:before { content:"Hey! "; color: #f00;}

Notice the extra space I added after Hey! on .red-element