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<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="UTF-8">
</head>
<body>
<!-- Bug 1219068 -->
<math style="position:absolute; top: 0; font-size:1em; z-index: 0;" display="block">
<mrow>
<mo>|</mo>
<mrow>
<mi>f</mi>
<mrow>
<mn>(</mn>
<mi>x</mi>
<mn>)</mn>
</mrow>
<mn>-</mn>
<mrow>
<mi>f</mi>
<mrow>
<mn>(</mn>
<msub>
<mi>x</mi>
<mn>0</mn>
</msub>
<mn>)</mn>
</mrow>
</mrow>
</mrow>
<mo>|</mo>
</mrow>
</math>
<div id="hider"
style="position:absolute; top:0; left:0; background-color:green;
height:1em; width:100%; z-index:1; padding-top:5px;
padding-bottom:5px; visibility:hidden" />
<script>
function obscureMathML() {
var hider = document.getElementById("hider");
hider.style.visibility="visible";
// The math should now be completely obscured
document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate", obscureMathML);
</script>
</body>
</html>
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