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CSS box-sizing 属性
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<!DOCTYPE html> <html> <head> <style> div.container { width: 100%; border: 2px solid black; } div.box { box-sizing: border-box; width: 50%; border: 5px solid red; float: left; } </style> </head> <body> <div class="container"> <div class="box">This div occupies the left half</div> <div class="box">This div occupies the right half</div> <div style="clear:both;"></div> </div> </body> </html>