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chromium/chrome/test/data/save_page/style.htm 

<!doctype html>
<html>
  <head>
    <link rel="stylesheet" type="text/css" href="style.css">
    <style>
      #iframeA { visibility: hidden; }
    </style>
  </head>
  <body>
    Content verification marker:
    style.htm: af84c3ca-0fc6-4b0d-bf7a-5ac18a4dab62
    <br><br>

    <!-- Hidden but affecting layout -->
    <iframe
      id="iframeA"
      srcdoc="err_hidden_frameA">
    </iframe>
    <br><br>

    <iframe
      class="iframeB"
      srcdoc="err_hidden_frameB">
    </iframe>
    <br><br>

    <!-- Hidden but affecting layout -->
    <iframe
      id="iframeC"
      srcdoc="err_hidden_frameC"
      style="visibility: hidden">
    </iframe>
    <br><br>

    <!-- Hidden and does not affect layout -->
    <iframe
      id="iframeD"
      srcdoc="err_hidden_frameD"
      hidden="true">
    </iframe>
    <br><br>

    <!-- Hidden and does not affect layout -->
    <iframe
      id="iframeE"
      srcdoc="err_hidden_frameE"
      style="display: none">
    </iframe>
    <br><br>

    <iframe
      id="iframeF"
      srcdoc="frameF: c9539ccd-47b0-47cf-a03b-734614865872">
    </iframe>
    <br><br>
  </body>
</html>