Frame elements missing valid long descriptions

This file deomostrates a frame that requires a "longdesc".

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"
    "http://www.w3.org/TR/html4/frameset.dtd">
<html lang="en">
<head>
<title>Frame elements missing valid long descriptions</title>
</head>
<frameset rows="100,100,200,200">
   <frame src="TableData.htm">
   <frame src="TableLayout1.htm" title="first frame title" />
   <frame src="TableLayout2.htm" name="second" title="second frame title" />
   <frame src="TableLayout3.htm" name="third" title="third frame title" longdesc="thirdframedesc.htm" />
</frameset>
</html>