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<!DOCTYPE html>
<html class="reftest-wait">
<head>
<style>
#checkbox {
position: absolute;
left: 0px;
top: 0px;
background: linear-gradient(to right, white, brown);
}
#toremove {
position: absolute;
left: 0px;
top: 0px;
width: 100px;
height: 0px;
background: black;
}
</style>
</head>
<body>
<div id="checkbox">
<input type="checkbox">
</div>
<div id="toremove">
</div>
</body>
<script type="text/javascript">
var checkBox = document.getElementById("checkbox");
var toRemove = document.getElementById("toremove");
toRemove.style.height = checkBox.offsetHeight / 2 + 0.2 + "px";
function boom()
{
toRemove.remove();
document.documentElement.className = "";
}
window.addEventListener("MozReftestInvalidate", boom);
</script>
</html>