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chromium/third_party/blink/web_tests/external/wpt/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/img-no-alt-replaced.html 

<!doctype html>
<title>Images without alt attribute or with an empty alt attribute render as replaced elements regardless of src</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="author" href="mailto:[email protected]" title="Yu Han">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1196668">
<link rel="help" href="https://crbug.com/753868">
<link ref="help" href="https://html.spec.whatwg.org/multipage/rendering.html#images-3">
<style>
  img {
    width: 100px;
    height: 150px;
  }
</style>
<img>
<img src="broken">
<img alt="">
<img alt>
<img src="broken" alt="">
<script>
const t = async_test("Images without alt attribute or with an empty alt attribute render as replaced elements regardless of src");
onload = t.step_func_done(function() {
  for (const img of document.querySelectorAll("img")) {
    assert_equals(img.offsetWidth, 100, `width: ${img.outerHTML}`);
    assert_equals(img.offsetHeight, 150, `height: ${img.outerHTML}`);
  }
});
</script>