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<p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> </div> <div id="right"> <p>right</p> <p>right</p> <p>right</p> </div> </div> </body> </html> 子div: margin-bottom:-1000px; padding-bottom:1000px;
父div： overflow:hidden; zoom:1;
子div padding-bottom:1000px; 把自己的盒子向下推开 变高了；margin-bottom:-1000px; 让父div可以向上收缩到内容实体的高度，含内容实体高度最高的子div把父div的收缩挡住了，所以看上去3个div高度相等。其实空白的高度都是padding,是可以布局内容的padding,因为设置了负外边距
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