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+<!DOCTYPE html>
+ <html>
+ <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="hidden">
+ <mspace width="1em" height="1em" />
+ <msqrt class="hidden">
+ <mspace width="1em" height="1em" />
+ <msqrt class="visible">
+ <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>