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chromium/third_party/blink/web_tests/paint/invalidation/window-resize/window-resize-percent-html-expected.html 

<!DOCTYPE html>
<html style="height: 50%">
<body style="height: 100%; margin: 0">
    <div style="width: 50%; height: 50%; background-color: blue"></div>
</body>
</html>