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It is used for browsers which does not support frames, then <noframes> tag shows content enclosed in it to the user. The <body> element is placed in <noframes> tag as <frameset> tag replaces it. Usually some message indicating old browser is shown to the user, for example
<noframes>
<body>
<p>Your browser does not support frames. </p>
</body>
</noframes>Apply for HTML Certification
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