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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <style> body { background-image:url('smiley.gif'); background-repeat:no-repeat; background-attachment:fixed; background-position:center; } </style> </head> <body> <p><b>注意:</b>该属性工作在 Firefox 和 Opera, background-attachment 属性会被设置为 "fixed"。</p> </body> </html>