file_triggeringprincipal_subframe.html

Enable keyboard shortcuts

<!DOCTYPE HTML>

<html>

<head><meta charset='utf-8'></head>

<body>

<b>Sub Frame 2</b><br/>

<script type='application/javascript'>

  // make sure to set document.domain to same domain as frame 1

  window.onload = function() {

    document.domain = "mochi.test";

    //   let Frame 1 know that we are ready to run the test

    window.parent.parent.frames[0].postMessage({start: "startTest"}, "*");

};

</script>

</body>

</html>