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chromium
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chromium/content/test/data/navigation_controller/page_with_link_to_load_iframe.html 

<html>
<head></head>
<body>
  <p><a href="simple_page_1.html" id="link" target="frame">go</a>
  <p><iframe src="data:text/html,initial" name="frame"></iframe>
</body>
</html>