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

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
async_test(t => {
  x = new Image();
  x.loading = "auto";
  x.src = "resources/image.png?auto";
  x.onload = t.step_func_done();
  t.step_timeout(t.unreached_func("Disconnected loading=auto image loads " +
                                  "successfully, and doesn't timeout"), 2000);
}, "loading=auto for disconnected image");

async_test(t => {
  x = new Image();
  x.loading = "eager";
  x.src = "resources/image.png?eager";
  x.onload = t.step_func_done();
  t.step_timeout(t.unreached_func("Disconnected loading=eager image loads " +
                                  "successfully, and doesn't timeout"), 2000);
}, "loading=eager for disconnected image");

async_test(t => {
  x = new Image();
  x.loading = "lazy";
  x.src = "resources/image.png?lazy";
  x.onload = t.unreached_func("Disconnected loading=lazy image loads lazily.");
  t.step_timeout(t.step_func_done(), 2000);
}, "loading=lazy for disconnected image");
</script>
</body>