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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<body>
<p id="first">f<span>o</span>o</p>
<p id="second">bar</p>
<script>
document.body.offsetTop;
var p1 = document.getElementById("first");
var p2 = document.getElementById("second");
var selection = window.getSelection();
selection.setBaseAndExtent(p1.firstChild, 0, p2.firstChild, 2);
function doTest() {
selection.collapse(p2.firstChild, 3);
document.documentElement.removeAttribute('class');
}
document.addEventListener("MozReftestInvalidate", doTest);
</script>
</body>
</html>