testing/web-platform/tests/element-timing/resources/iframe-with-square-sends-entry.html

   1 <!DOCType html>
   2 <html>
   3 <style>
   4 body {
   5   margin: 0;
   6 }
   7 </style>
   8 <body>
   9 <script>
  10   const observer = new PerformanceObserver(entryList => {
  11     top.postMessage({
  12       'length' : entryList.getEntries().length,
  13       'entryType' : entryList.getEntries()[0].entryType,
  14       'rect' : entryList.getEntries()[0].intersectionRect,
  15     }, '*');
  16   });
  17   observer.observe({entryTypes: ['element']});
  18 </script>
  19 <img src=square100.png elementtiming=my_image/>
  20 </body>
  21 </html>