gecko-dev/content/html/document/test/test_bug463104.html

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HTML

<!DOCTYPE html>
<html>
<head>
<title>Noninteger coordinates test</title>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<div id="a" style="position: fixed; left: 5.5px; top: 5.5px; width: 100px; height: 100px; background: blue"></div>
<p style="margin-top: 110px">
<script>
var a = document.getElementById("a");
isnot(a, document.elementFromPoint(5, 5), "a shouldn't be found");
isnot(a, document.elementFromPoint(5.25, 5.25), "a shouldn't be found");
is(a, document.elementFromPoint(5.5, 5.5), "a should be found");
is(a, document.elementFromPoint(5.75, 5.75), "a should be found");
is(a, document.elementFromPoint(6, 6), "a should be found");
is(a, document.elementFromPoint(105, 105), "a should be found");
is(a, document.elementFromPoint(105.25, 105.25), "a should be found");
isnot(a, document.elementFromPoint(105.5, 105.5), "a shouldn't be found");
isnot(a, document.elementFromPoint(105.75, 105.75), "a shouldn't be found");
isnot(a, document.elementFromPoint(106, 106), "a shouldn't be found");
</script>
</body>
</html>