<!DOCTYPE html>
<html>
<meta charset=utf-8 />
<title>Element Timing: buffer elements before onload</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src="resources/element-timing-helpers.js"></script>
<body>
<img src=resources/slow-image.py?name=square20.png&sleep=500>
<script>
  /*
  In this test, a slow image is added to the frame to delay onload. The entry
  is available from the observer with the buffered flag set to true.
  */
  async_