<body onload="test()">
<form method="post" enctype="text/plain" action="mailto:">
Field 1: <input type="text" size="10" maxlength="40" name="to" value="one@example.org">
Field 2: <textarea name="body">Line 1
Line 2
@&amp;=,;?"+</textarea>
<input type="submit" value="Send"> 
</form>
<script>
function test() {
  if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitForPolicyDelegate();
    document.getElementsByTagName("form")[0].submit();
  }
}
</script>