1 files changed, 40 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-crossorigin-change.sub.html b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-crossorigin-change.sub.html
new file mode 100644
index 0000000000..84efc7b0d1
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-crossorigin-change.sub.html
@@ -0,0 +1,40 @@
+<!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>