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css: Image replacement
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| .ir{ | |
| border:0; | |
| font: 0/0 a; | |
| text-shadow: none; | |
| color: transparent; | |
| background-color: transparent; | |
| } |
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font:0/0 a – a shorthand property that zeros out the font size and line-height. The a value acts as a very short font-family (an idea taken from the BEM implementation of this method). The CSS validator complains that using 0/0 in the shorthand font property is not valid, but every browser accepts it and this appears to be an error in the validator. Using font:0px/0 a passes validation but it displayed as font:0/0 a in the code that the validator flags as valid.
http://nicolasgallagher.com/another-css-image-replacement-technique/