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diff --git a/docshell/test/navigation/test_triggeringprincipal_frame_same_origin_nav.html b/docshell/test/navigation/test_triggeringprincipal_frame_same_origin_nav.html
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+++ b/docshell/test/navigation/test_triggeringprincipal_frame_same_origin_nav.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Bug 1639195 - Test triggeringPrincipal for iframe same-origin navigations</title>
+  <!-- Including SimpleTest.js so we can use waitForExplicitFinish !-->
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<iframe style="width:100%;" id="testframe" src="http://example.com/"></iframe>
+
+<script type="text/javascript">
+/* We load an third-party iframe which then gets navigated by the iframe's
+ * parent by calling iframe.setAttribute("src", same-origin url) later in the
+ * test. We then verify the TriggeringPrincipal and LoadingPrincipal of the
+ * navigated iframe.
+ *
+ * +------------------------------------------+
+ * |                                          |
+ * |  +------------------+                    |
+ * |  | testframe        |                    |
+ * |  +------------------+                    |
+ * |                                          |
+ * | iframe.setAttribute("src",               |
+ * |                     same-origin url)     |
+ * |                                          |
+ * +------------------------------------------+
+ */
+
+var testframe = document.getElementById("testframe");
+
+window.addEventListener("message", receiveMessage);
+
+const TRIGGERING_PRINCIPAL_URI =
+  "http://mochi.test:8888/tests/docshell/test/navigation/test_triggeringprincipal_frame_same_origin_nav.html";
+
+const LOADING_PRINCIPAL_URI = TRIGGERING_PRINCIPAL_URI;
+
+function receiveMessage(event) {
+  is(event.data.triggeringPrincipalURI.split("?")[0], TRIGGERING_PRINCIPAL_URI,
+     "TriggeringPrincipal should be the parent iframe");
+  is(event.data.loadingPrincipalURI.split("?")[0], TRIGGERING_PRINCIPAL_URI,
+     "LoadingPrincipal should be the parent iframe");
+
+  window.removeEventListener("message", receiveMessage);
+  SimpleTest.finish();
+}
+
+function performNavigation() {
+  testframe.removeEventListener("load", performNavigation);
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  testframe.setAttribute("src", "http://example.com/tests/docshell/test/navigation/file_triggeringprincipal_subframe_same_origin_nav.html");
+}
+
+// start the test
+SimpleTest.waitForExplicitFinish();
+
+testframe.addEventListener("load", performNavigation);
+</script>
+
+</body>
+</html>