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chromium/third_party/blink/web_tests/fast/text-autosizing/positioned-out-of-flow.html 

<!DOCTYPE html>
<html>
<head>

<meta name="viewport" content="width=800">
<style>
html { font-size: 16px; }
body { width: 800px; margin: 0; overflow-y: hidden; }
</style>

<script src="resources/autosizingTest.js"></script>

</head>
<body>

<div style="position: fixed; top: 0; left: 0; right: 0">
    This text should not be autosized (its computed font size should remain 16px), since the position:fixed causes it to be considered to have constrained height.<br>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
    <div style="float: left; width: 100%">
        This text should be autosized to 40px computed font size, since it is within a float:left, so constrained height is no longer a concern.<br>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor.
    </div>
</div>

<div style="position: absolute; bottom: 0; left: 0; right: 0">
    This text should not be autosized (its computed font size should remain 16px), since the position:absolute causes it to be considered to have constrained height.<br>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
    <div style="overflow: auto">
        This text should be autosized to 40px computed font size, since it is within an overflow:auto, so constrained height is no longer a concern.<br>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor.
    </div>
</div>

</body>
</html>