iframe_extension.html | Explore in Territory

<!DOCTYPE html>
<html>
  <head>
    <title>Iframe with extension</title>
  </head>
  <body>
    <iframe id="testframe" src="chrome-extension://imgnaknjpncihbkeihnbacmcoijbebgm/page.html">
    </iframe>
  </body>
</html>

chromium/chrome/test/data/chromedriver/iframe_extension.html