file_bug1328501.html

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<!DOCTYPE html>

<html lang="en">

  <head>

    <meta charset="utf-8">

    <title>Page with iframes</title>

    <script type="application/javascript">

    let promiseResolvers = {

      "testFrame1": {},

      "testFrame2": {},

};

    let promises = [

      new Promise(r => promiseResolvers.testFrame1.resolve = r),

      new Promise(r => promiseResolvers.testFrame2.resolve = r),

];

    function frameLoaded(frame) {

      promiseResolvers[frame].resolve();

    Promise.all(promises).then(() => window.dispatchEvent(new Event("frames-loaded")));

    </script>

  </head>

  <body onunload="">

    <div>

      <iframe id="testFrame1" src="dummy_page.html" onload="frameLoaded(this.id);" ></iframe>

      <iframe id="testFrame2" src="dummy_page.html" onload="frameLoaded(this.id);" ></iframe>

    </div>

  </body>

</html>