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chromium/third_party/blink/web_tests/fast/sub-pixel/computedstylemargin.html 

<!DOCTYPE html>
<html>
    <head>
        <script src="../../resources/js-test.js"></script>
    </head>
    <body style="margin: 0; padding: 0;">
        <div style="margin: 0; width: 300px">
            <div id="test" style="width: 200px; height: 200px; margin: 0.5px 1.5px 2.5px 3.5px; background: blue;"></div>
            <div id="test2" style="width: 299px; height: 200px; margin: 5px auto; background: blue;"></div>
        </div>
        <script>
            // Fixed width margins.
            var style = window.getComputedStyle(document.getElementById('test'));
            shouldBe('style.marginTop', "'0.5px'");
            shouldBe('style.marginRight', "'1.5px'");
            shouldBe('style.marginBottom', "'2.5px'");
            shouldBe('style.marginLeft', "'3.5px'");
            
            // Auto left/right margin.
            var style = window.getComputedStyle(document.getElementById('test2'));
            shouldBe('style.marginLeft', "'0.5px'");
            shouldBe('style.marginRight', "'0.5px'");
        </script>
    </body>
</html>