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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/reference/flexitem-stretch-range-ref.html 

<!DOCTYPE html>
<html>
<body>
<p>When stretching a range input, the thumb should be centered vertically.</p>
<div style="height: 200px;">
    <input type="range" style="width: 100%; height: 100%; margin: 0; box-sizing: border-box;">
</div>
</body>
</html>