File: image-base-url.html

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<!DOCTYPE html>
<html>
<head>
  <title>Image load parses URL after microtask runs</title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>

<body>
<img id="img">
<script>
const t = async_test("An image request's parsed URL should be affected by a " +
                     "dynamically-inserted <base>, if it was inserted before " +
                     "the image request microtask runs");

t.step(() => {
  const elm = document.getElementById('img');
  elm.src = 'resources/image.png';
  elm.onload = t.unreached_func("The image should have failed to load, as " +
                                "the request URL should be affected by the " +
                                "<base> element");
  elm.onerror = t.step_func_done();

  const base = document.createElement("base");
  base.setAttribute("href", "bogus/");
  document.head.appendChild(base);
});
</script>
</body>
</html>