file_pdfjs_middle_iframe.html

Enable keyboard shortcuts

<!doctype html>

<html>

  <head>

    <meta charset="utf-8" />

    <title>Intermediate frame</title>

  </head>

  <body style="margin: 0">

    <iframe src="file_pdfjs_target.html" width="700" height="500"></iframe>

  </body>

</html>