Producing web pages
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12.2 Describe the purpose of frames and how frames relate to each other

You should describe the purpose of frames and how frames relate to each other if it is not obvious by frame titles alone. Use longdesc to provide a further description. For example:

<frameset rows="10%, 90%">
<frame src="navigation.html" title="Navigation bar" longdesc="frame-desc.html#navbar">
<frame src="content.html" title="Main Content" longdesc="frame-desc.html#main">
</FRAMESET>

The frame-desc.html might say something like:

#Navbar - This frame provides links to the major sections of the site: Products & Services, Support, ......

#Main - This frame displays the page you select on the navigation bar.