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