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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-img-element/nonexistent-image.html 

<!DOCTYPE HTML>
<meta charset="utf-8">
<title>Loading an nonexisting image should fail; triggering appropriate events</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<img>

<script>
  async_test(function(t) {
    var img = document.querySelector("img");
    img.onload = this.step_func_done(function() {
      assert_unreached("image.onload() was not supposed to be called");
    });
    img.onerror = this.step_func_done(function(e) {
      assert_equals(e.type, "error", "image.onerror() called");
      t.done();
    });
    img.src = "404";
  });
</script>