Here is a less known and rather exotic CSS hack, visible for Internet Explorer based on a rendering bug. Unfortunately, it is visible both in versions 6 and 7, but still it can be useful as a last resort for styling.
And here it comes:
h1
{
color: green;
.color: red;
}
Internet Explorer 6 and 7 will render <h1>...</h1> in red, while all other browsers will disregard the dot-prefixed property.
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