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<!DOCTYPE html>
<html reftest-zoom="0.5">
<head>
<!-- Default to invisible text -->
<style type="text/css" media="screen, print">
.hidden {
color: white;
}
.visible {
color: black;
}
</style>
</head>
<body>
<!-- Nest successive radicals and test that the horizontal bar of one of them is drawn.
Because the comparison is for inequality with about:blank, at most one can be visible -->
<math>
<mrow>
<msqrt class="hidden">
<mspace width="1em" height="1em" />
<msqrt class="hidden">
<mspace width="1em" height="1em" />
<msqrt class="hidden">
<mspace width="1em" height="1em" />
<msqrt class="hidden">
<mspace width="1em" height="1em" />
<msqrt class="visible">
<mspace width="1em" height="1em" />
<msqrt class="hidden">
<mspace width="1em" height="1em" />
<msqrt class="hidden">
<mspace width="20em" height="1em" />
</msqrt>
</msqrt>
</msqrt>
</msqrt>
</msqrt>
</msqrt>
</msqrt>
</mrow>
</math>
<!-- Block out all but the horizontal bar of the visible radical -->
<div style="position: absolute; top: 5px; left: 0px;
width: 20em; height: 10em; background: white;"></div>
</body>
</html>
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