link-load-event-alt-001.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/document-metadata/the-link-element/link-load-event-alt-001.html - WPT Dashboard Interop Dashboard

<!doctype html>

<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-link-element">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<body>

<script>

  async_test(function (t) {

    let reached_end = false;

    const BAD = "file:///nope.css";

    // This ongoing load is needed to trigger the deferral codepath.

      const ongoing = document.createElement("link");

      ongoing.rel = "stylesheet";

      ongoing.href = "style.css?link-load-event-alt";

      ongoing.onerror = t.unreached_func("Shouldn't error");

      document.head.appendChild(ongoing);

    const alt = document.createElement("link");

    alt.rel = "alternate stylesheet";

    alt.title = "alt";

    alt.href = BAD;

    alt.onerror = t.step_func_done(() => {

      assert_true(reached_end, "Shouldn't fire error event synchronously");

});

    alt.onload = t.unreached_func("Should not load");

    document.head.appendChild(alt);

    const s = document.createElement("style");

    s.textContent = '@import url("' + BAD + '");';

    document.head.appendChild(s);

    reached_end = true;

});

</script>