<html>
<body>
  Simple HTML file with many same-origin iframes.
  <iframe srcdoc="<html><body>Hello</body></html>"></iframe>
  <iframe srcdoc="<html><body>Hello</body></html>"></iframe>
  <iframe srcdoc="<html><body>Hello</body></html>"></iframe>
  <iframe srcdoc="<html><body>Hello</body></html>"></iframe>
  <iframe srcdoc="<html><body>Hello</body></html>"></iframe>
  <iframe srcdoc="<html><body>Hello</body></html>"></iframe>
  <iframe srcdoc="<html><body>Hello</body></html>"></iframe>
  <iframe srcdoc="<html><body>Hello</body></html>"></iframe>
  <iframe srcdoc="<html><body>Hello</body></html>"></iframe>
</body>
</html>