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<!DOCTYPE html> <html> <body> <iframe id="myframe" src="demo_iframe2.htm" width="100%" height="500" style="background:#f1f1f1;"> <p>您的浏览器不支持 iframe。</p> </iframe> <p>单击 iframe 内的按钮可更改 iframe 父文档的背景颜色。</p> </body> </html>