
<div class="div1">
<div class="div2">div2</div>
<div class="div3">div3</div>
</div>
css:
body,div {padding:0;margin:0;}
.div1 {width:504px;border:1px red solid;overflow:hidden;zoom:1;}//overflow:hidden;zoom:1;是清除浮动的意思;
.div2 {width:300px;height:200px;border:1px blue solid;float:left;}
.div3 {width:200px;height:400px;border:1px green solid;float:left;}
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