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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-img-element/img-src-in-synthetic-document.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://github.com/whatwg/html/issues/9855">
<link rel=help href="https://html.spec.whatwg.org/#reflecting-content-attributes-in-idl-attributes">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
test(() => {
  const doc = document.implementation.createHTMLDocument('');
  const img = doc.createElement('img');
  img.setAttribute('src', '/test');
  doc.body.appendChild(img);
  assert_equals(img.src, '/test');
}, 'HTMLImageElement.src should return the string from the attribute in about:blank documents.');
</script>