image-loading-lazy-crossorigin-change.sub.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-img-element/image-loading-lazy-crossorigin-change.sub.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<head>

  <title>Deferred images with loading='lazy' use the latest crossorigin attribute</title>

  <link rel="author" title="Raj T" href="mailto:rajendrant@chromium.org">

  <link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com">

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

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

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

</head>

<script>

  const img = new ElementLoadPromise("cross-origin");

  async_test(function(t) {

    window.addEventListener("load", t.step_func(() => {

      // At this point the image's #updating-the-image-data algorithm has been

      // invoked, and the image request has been deferred. The deferred

      // cross-origin image request was created with the `no-cors` request mode,

      // which would succeed to load the cross-origin image.

      // While the request is deferred, we'll set the `crossorigin` attribute to a

      // value that would cause the image request to fail. Since `crossorigin`

      // mutations trigger another #updating-the-image-data invocation (replacing

      // the first one), when we scroll the image into view, the image should be

      // fetched with the latest `crossorigin` attribute value, and fail to load.

      img.element().crossOrigin = 'anonymous';

      img.element().scrollIntoView();

    }));

    img.promise

      .then(t.unreached_func("The image should not load."))

      .catch(t.step_func(() => { img.element().onload = t.step_func_done(); img.element().src = 'resources/image.png'; }));

  }, "Test that when deferred image is loaded, it uses the latest crossorigin attribute.");

</script>

<body>

  <div style="height:1000vh;"></div>

  <img id="cross-origin" loading="lazy"

       src='http://{{hosts[alt][]}}:{{ports[http][0]}}/html/semantics/embedded-content/the-img-element/resources/image.png'

       onload="img.resolve();" onerror="img.reject();">

</body>