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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> </head> <body> <iframe src="demo_iframe.htm" width="200" height="200"></iframe> <p>一些旧的浏览器不支持 iframe。</p> <p>如果浏览器不支持 iframes 则不会显示。</p> </body> </html>