xxxxxxxxxx<html><head><meta charset="utf-8"> <title>W3Cschool教程(w3cschool.cn)</title><style> div.ex { width:220px; padding:10px; border:5px solid gray; margin:0px; }</style></head><body> <img src="/attachments/cover/cover_cssref.jpeg" width="250" height="250" /> <div class="ex">上面的图片是250像素宽。这个元素的总宽度也是250px。</div></body></html>