chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-iframe-element/support/iframe_sandbox_006.htm

<!DOCTYPE html>
<html>
<head>
<title>Form submission</title>
</head>
<body>
    <form id="form1" action="standalone-pass.htm">
      <span>Name: </span><input type="text" name="name" value="browser" /><br />
      <input id="submitButton" type="submit" value="Submit Form" />
    </form>
</body>
</html>