1 files changed, 45 insertions, 0 deletions
diff --git a/testing/web-platform/tests/element-timing/cross-origin-element.sub.html b/testing/web-platform/tests/element-timing/cross-origin-element.sub.html
new file mode 100644
index 0000000000..1052bf246d
--- /dev/null
+++ b/testing/web-platform/tests/element-timing/cross-origin-element.sub.html
@@ -0,0 +1,45 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: observe cross-origin images but without renderTime</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+  async_test((t) => {
+    assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
+    let img;
+    const pathname = 'http://{{domains[www]}}:{{ports[http][1]}}'
+          + '/element-timing/resources/square100.png';
+    const observer = new PerformanceObserver(
+      t.step_func_done((entryList) => {
+        assert_equals(entryList.getEntries().length, 1);
+        const entry = entryList.getEntries()[0];
+        checkElement(entry, pathname, 'my_image', 'the_id', 0, img);
+        assert_equals(entry.renderTime, 0,
+          'The renderTime of a cross-origin image should be 0.');
+        checkRect(entry, [0, 100, 0, 100]);
+        checkNaturalSize(entry, 100, 100);
+      })
+    );
+    observer.observe({entryTypes: ['element']});
+    // We add the image during onload to be sure that the observer is registered
+    // in time for it to observe the element timing.
+    // TODO(npm): change observer to use buffered flag.
+    window.onload = t.step_func(() => {
+      // Add a cross origin image resource.
+      img = document.createElement('img');
+      img.src = pathname;
+      img.setAttribute('elementtiming', 'my_image');
+      img.setAttribute('id', 'the_id');
+      document.body.appendChild(img);
+    });
+  }, 'Cross-origin image element is NOT observable.');
+</script>
+
+</body>