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diff --git a/testing/web-platform/tests/resource-timing/iframe-sequence-of-events.html b/testing/web-platform/tests/resource-timing/iframe-sequence-of-events.html
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+++ b/testing/web-platform/tests/resource-timing/iframe-sequence-of-events.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Test the sequence of events when reporting iframe timing.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/frame-timing.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<body>
+<script>
+  test_frame_timing_before_load_event('iframe');
+
+  const host_info = get_host_info();
+  const types = ['ORIGIN', 'HTTP_REMOTE_ORIGIN', 'HTTP_NOTSAMESITE_ORIGIN'];
+  for (const a of types) {
+    for (const b of types) {
+      for (const tao of [true, false]) {
+        test_frame_timing_change_src('iframe', host_info[a], host_info[b], tao,
+        `Changing the src of an iframe (${a}->${b}) ${tao ? "with" : "without"} TAO should result in an RT entry`);
+      }
+    }
+  }
+</script>
+</body>