W3School TIY Editor
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<html> <body> <iframe src="/example/hdom/frame_a.html" id="frame1" marginheight="50"></iframe> <br /><br /> <script type="text/javascript"> x=document.getElementById("frame1"); document.write("Top and bottom margins of the iframe are: "); document.write(x.marginHeight); </script> </body> </html>