CSS Tricks: Generated Content on Replaced Elements

Using pseudo-elements like :before and :after helps you specifying which content should be inserted before (or after) the content of an element. Replaced elements like input or img have no content, therefore, you shouldn?t be able to use generated content for them.
But, there?s almost always a but, it seems that you can use generated
content on a number of replaced elements that varies from...

Source: http://feeds.dzone.com/~r/zones/css/~3/fCA9uk5tau0/css-tricks-generated-content

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