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chromium/third_party/blink/web_tests/fast/sub-pixel/size-of-span-with-different-positions.html 

<html>
<head>
<style>
    .testContent {
        font-face: Arial; font-size: 16px;
    }
</style>
</head>
<body>
<div id="testContent">
    <span id="span-position-static"   style="position:static">T</span>
    <span id="span-position-fixed"    style="position:fixed">T</span>
    <span id="span-position-absolute" style="position:absolute">T</span>
    <span id="span-position-relative" style="position:relative">T</span>
</div>
<script src="../../resources/js-test.js"></script>
<script>
    description("Test case for bug 90097. This tests span sizes with different CSS position attributes.");
    var spans = testContent.querySelectorAll('span');
    var expected_width = document.getElementById('span-position-static').getBoundingClientRect().width;
    // if expected_width is integral, all should match, otherwise should be close
    var tolerance = expected_width % 1.0 == 0.0 ? 0.0 : 1.0 / 60;

    shouldBeCloseTo('document.getElementById("span-position-fixed").getBoundingClientRect().width', expected_width, tolerance, true);
    shouldBeCloseTo('document.getElementById("span-position-absolute").getBoundingClientRect().width', expected_width, tolerance, true);
    shouldBeCloseTo('document.getElementById("span-position-relative").getBoundingClientRect().width', expected_width, tolerance, true);
    document.getElementById("testContent").style.display = 'none';
</script>
</body>
</html>