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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <style> div.ex { width:220px; padding:10px; border:5px solid gray; margin:0px; } </style> </head> <body> <img src="w3css.gif" width="250" height="250" /> <div class="ex">上面的图片是250 px宽。 这个元素的总宽度也是250 px。</div> </body> </html>