51help TIY
码：
<html> <head> <style> img.x { position:absolute; left:0px; top:0px; z-index:-1; } </style> </head> <body> <h1>题</h1> <img class="x" src="../i/eg_bulbon.gif" tppabs="http://www.51help.tk/i/eg_bulbon.gif" /> <p>默认 z-index 是 0。Z-index -1 先级。</p> </body> </html>
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