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源代码：
点击运行
<!DOCTYPE html> <html> <body> <iframe id="myframe" src="https://www.ancii.com" longdesc="w3s.txt"> <p>Your browser does not support iframes.</p> </iframe> <p>The URL of the long description is: <script> document.write(document.getElementById("myframe").longDesc); </script> <p> </body> </html>
运行结果
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