.left{ width:100px; height:100px; background-color:#eeeeee; border:1px solid green; float:left;}.right{ width:100px; height:100px; background-color:#aaaaaa; border:1px solid red; float:right;}#b{ width:100px; height:100px; background-color:#555555; border:1px solid pink; //float:left; //clear:left;}
<html><head><meta charset="utf-8"><link type="text/css" rel="stylesheet" href="tmp.css"></head><body><div class="left">A</div><div class="left">B</div><div class="right">C</div><div id="b">X</div></body></html>
還沒有懂。記下來以後再解釋吧。
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