docshell/test/browser/file_bug1328501.html

   1 <!DOCTYPE html>
   2 <html lang="en">
   3   <head>
   4     <meta charset="utf-8">
   5     <title>Page with iframes</title>
   6     <script type="application/javascript">
   7     let promiseResolvers = {
   8       "testFrame1": {},
   9       "testFrame2": {},
  10     };
  11     let promises = [
  12       new Promise(r => promiseResolvers.testFrame1.resolve = r),
  13       new Promise(r => promiseResolvers.testFrame2.resolve = r),
  14     ];
  15     function frameLoaded(frame) {
  16       promiseResolvers[frame].resolve();
  17     }
  18     Promise.all(promises).then(() => window.dispatchEvent(new Event("frames-loaded")));
  19     </script>
  20   </head>
  21   <body onunload="">
  22     <div>
  23       <iframe id="testFrame1" src="dummy_page.html" onload="frameLoaded(this.id);" ></iframe>
  24       <iframe id="testFrame2" src="dummy_page.html" onload="frameLoaded(this.id);" ></iframe>
  25     </div>
  26   </body>
  27 </html>