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