file_toplevel.html

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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <title>Top-level frame document</title>

</head>

<body>

  <iframe src="file_iframe.html"></iframe>

  <iframe src="about:blank"></iframe>

  <iframe src="data:,data-URL"></iframe>

  <iframe src="javascript://void"></iframe>

  <iframe src="javascript:true"></iframe><!-- renders document containing "true" -->

  <iframe srcdoc="Iframe srcdoc"></iframe>

</body>

</html>