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小库网 

<style>

h1:after {content:url(smiley.gif);}

</style>

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<h1>This is a heading</h1>

<p>The :after pseudo-element inserts content after an element.</p>

<h1>This is a heading</h1>

<p><b>注意:</b>仅当!DOCTYPE 已经声明 IE8支持这个内容属性.</p>

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