toolkit/content/tests/mochitest/file_mousecapture2.html


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<html><p>One</p>
<p id="myStyle">Two</p>
<p style='margin-top: 4000px'>This is some text</p>
</html>

<script type="application/javascript">
document.getElementById("myStyle").style.marginTop = new URL(location.href).searchParams.get("topPos");
</script>