Superglue
/
Editor


			
				
					
						
						
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							<!-- This Source Code Form is subject to the terms of the Mozilla Public

   - License, v. 2.0. If a copy of the MPL was not distributed with this

   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->

<html>
  <body>
    <button id=post>post!</button>
  </body>
  <script>

    window.addEventListener("message", event => {

      console.log("Document message", event, event.data, event.source !== window && event.source === window.parent);

    });

    window.addEventListener("click", event => {

      if (event.target.id === "post") {

          console.log("click!")

          window.parent.postMessage("ping!", "*");

      }

    });

    console.log(window.parent === window)

  </script>
</html>