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chromium/third_party/blink/web_tests/external/wpt/page-visibility/resources/blank_page_green.html 

<!DOCTYPE HTML>
<html>
    <head>
        <meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
        <title>Green Test Page</title>
    </head>
    <body style="background-color:#00FF00;">
        <h1>Placeholder</h1>
    </body>
</html>