File: embed-change-src-2.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>The embed element update with new content when the src attribute is set</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-embed-element">
<link rel="help" href="https://crbug.com/479233864">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
promise_test(async () => {
  const embed = document.body.appendChild(document.createElement('embed'));

  const boundsBefore = embed.getBoundingClientRect();
  assert_equals(boundsBefore.width, 0, 'represents nothing');

  const loadPromise = new Promise(resolve => embed.onload = resolve);
  embed.src = 'data:image/svg+xml,<svg height="100" width="100" xmlns="http://www.w3.org/2000/svg"><rect height="100" width="100" fill="green"/></svg>';

  await loadPromise;

  const boundsAfter = embed.getBoundingClientRect();
  assert_equals(boundsAfter.width, 100, 'represents its content navigable');
});
</script>