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chromium/third_party/blink/web_tests/external/wpt/html/embedded-content/the-img-element/attr-img-fetchpriority.html 

<!DOCTYPE html>
<title>Fetch Priority - Image element</title>
<meta name="author" title="Dominic Farolino" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<img id=img1 src=/images/green.png fetchpriority=high>
<img id=img2 src=/images/green.png fetchpriority=low>
<img id=img3 src=/images/green.png fetchpriority=auto>
<img id=img4 src=/images/green.png fetchpriority=xyz>
<img id=img5 src=/images/green.png>

<script>
  test(() => {
    assert_equals(img1.fetchPriority, "high", "high fetchPriority is a valid IDL value on the image element");
    assert_equals(img2.fetchPriority, "low", "low fetchPriority is a valid IDL value on the image element");
    assert_equals(img3.fetchPriority, "auto", "auto fetchPriority is a valid IDL value on the image element");
    assert_equals(img4.fetchPriority, "auto", "invalid fetchPriority reflects as 'auto' IDL attribute on the image element");
    assert_equals(img5.fetchPriority, "auto", "missing fetchPriority reflects as 'auto' IDL attribute on the image element");
  }, "fetchpriority attribute on <img> elements should reflect valid IDL values");

  test(() => {
    const img = new Image();
    assert_equals(img.fetchPriority, "auto");
  }, "fetchPriority of new Image() is 'auto'");
</script>