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CSS Layout | layers, absolute and relative positioning and floating elements
CSS - Contents and compatibility
IE 8-10 (and maybe older ones, too) have a slight bug: clicking the mouse down on a nested element does not trigger :active . Try it in the test page by depressing the mouse button on one of the code examples. The :active styles do not kick in. IE doesn’t react to the Back and Forward buttons: the element doesn’t apply or remove the pseudo-class at all. This used to be an Opera problem, while IE used to get it right.CSS Browser Compatability
Path // → → CSS AND SPACING So by now you have your page and all your text styled and formatted the way you want. Now it's time to start giving parts of your page room to breathe, by spacing them out with margins and padding. Henceforth, you will be able to space out all your page's parts down to the pixel. This page was last updated on 2010-01-08 The CSS Box Model

