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chromium/third_party/blink/web_tests/compositing/gestures/resources/1-nested-frame-composited-expected.html 

<!DOCTYPE html>
<head></head>
<body>
<iframe src="1-frame-noncomposited-expected.html" id="targetFrame"  style="width: 400px; height: 200px; will-change: transform;"></iframe>
</body>
</html>