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源代码：
点击运行
<!DOCTYPE html> <html> <head> <style> body { background-image: url('/statics/images/course/smiley.gif'); background-repeat: no-repeat; background-attachment:fixed; background-position: 50px 100px; } </style> </head> <body> <p><b>Note:</b> For this to work in Firefox and Opera, the background-attachment property must be set to "fixed".</p> </body> </html>
运行结果
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