chromium/third_party/blink/web_tests/fast/text-autosizing/pseudo-scale-factor.html

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=800">
<style>
    html { font-size: 16px; }
    body { width: 800px; margin: 0; overflow: hidden; }
    #pseudo1:first-letter { font-size: 32px; color: red; }
    #pseudo2::before { font-size: 32px; content: "Before!"; color: green; }
    #pseudo2::after { font-size: 32px; content: "After!"; color: blue; }
</style>

<script src="resources/autosizingTest.js"></script>
</head>
<body>
    <div id="pseudo1">This sentence should start with a big letter 'T' for the first letter in the color red. There should be enough text for the sentence to autosize.</div>
    <div id="pseudo2">This text should have the word 'Before!' in big text in the color green before it and the word 'After!' in big text in the color blue after it.</div>
</body>
</html>