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<!DOCTYPE html>
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<html>
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<body>
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<span id="x" style="position: sticky; bottom: 75px;">
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<div></div>
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</span>
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<script>
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document.addEventListener("MozReftestInvalidate", function() {
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document.getElementById('x').style.bottom = '-3000px';
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});
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</script>
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</body>
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</html>
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