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chromium/third_party/blink/web_tests/external/wpt/css/CSS2/stacking-context/opacity-transition-change-parent-stacking-context-ref.html 

<!doctype HTML>
<title>CSS Test Reference</title>
<link rel="author" title="Philip Rogers" href="mailto:[email protected]" />
<div style="opacity: 1; width: 100px; height: 100px; background: green;"></div>