a[href$='.doc'] {
	padding:0 20px 0 0;
	background:transparent url(/graphics/icons/doc.gif) no-repeat center right;
}

CSS Attribute selectors are very powerful giving you many options to control styles of different elements e.g. you can add an icon based on the href attribute of the a tag to let the user know whether link points to an image, pdf, doc file etc.

Attribute-Specific Icons

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