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+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-referrerpolicy-change.sub.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<head>
+  <title>Deferred loading=lazy iframes are fetched with the parse-time
+         `referrerpolicy` attribute</title>
+  <link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
+  <link rel="author" title="Raj T" href="mailto:rajendrant@chromium.org">
+  <link rel="help" href="https://github.com/scott-little/lazyload">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="../resources/common.js"></script>
+</head>
+
+<script>
+  const below_viewport_iframe = new ElementLoadPromise("below_viewport_iframe");
+
+  async_test(function(t) {
+    // Change the referrer-policy and scroll down to load the deferred elements.
+    window.addEventListener("load", t.step_func(() => {
+      below_viewport_iframe.element().referrerPolicy = "no-referrer";
+      below_viewport_iframe.element().scrollIntoView();
+    }));
+
+    below_viewport_iframe.promise.then(
+      t.step_func_done(function() {
+        // The `Referer` header should be the full URL, as specified by the
+        // iframe's `referrerpolicy` attribute at parse-time, and not the origin
+        // (as specified in meta referrer tag) or null (as overridden
+        // referrerpolicy=no-referrer after load deferral).
+        assert_true(below_viewport_iframe.element().contentDocument.body.innerHTML
+                    .includes("Referer: http://{{location[host]}}{{location[path]}}"),
+                    "The iframe's `Referer` should be the referrer's full URL");
+      }));
+  }, "Test that when a deferred iframe is fetched, it uses the " +
+     "`referrerpolicy` specified at parse-time");
+</script>
+
+<body>
+  <meta name="referrer" content="origin">
+  <div style="height:1000vh;"></div>
+  <iframe id="below_viewport_iframe" src="/xhr/resources/echo-headers.py"
+          loading="lazy" width="200px" height="100px"
+          referrerpolicy="unsafe-url"
+          onload="below_viewport_iframe.resolve();">
+  </iframe>
+</body>