diff --git a/testing/web-platform/tests/navigation-timing/resources/secure-connection-interim.html b/testing/web-platform/tests/navigation-timing/resources/secure-connection-interim.html
new file mode 100644
index 0000000000000..e40b00bedbd59
--- /dev/null
+++ b/testing/web-platform/tests/navigation-timing/resources/secure-connection-interim.html
@@ -0,0 +1,8 @@
+<!doctype html>
+<script>
+  window.addEventListener("message", e => {
+    window.top.postMessage(e.data, "*");
+  });
+</script>
+<iframe src="secure-connection-test.html">
+
diff --git a/testing/web-platform/tests/navigation-timing/resources/secure-connection-interim.html.headers b/testing/web-platform/tests/navigation-timing/resources/secure-connection-interim.html.headers
new file mode 100644
index 0000000000000..b70fbaf3b020a
--- /dev/null
+++ b/testing/web-platform/tests/navigation-timing/resources/secure-connection-interim.html.headers
@@ -0,0 +1,3 @@
+Connection: Keep-Alive
+Content-Length: 170
+
diff --git a/testing/web-platform/tests/navigation-timing/resources/secure-connection-test.html b/testing/web-platform/tests/navigation-timing/resources/secure-connection-test.html
new file mode 100644
index 0000000000000..63a80e062bfad
--- /dev/null
+++ b/testing/web-platform/tests/navigation-timing/resources/secure-connection-test.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<script>
+const entries =  performance.getEntriesByType("navigation");
+if (!entries) {
+  window.top.postMessage("FAIL - not supported", "*");
+}
+const entry = entries[0];
+if (entry.secureConnectionStart != entry.fetchStart) {
+  window.top.postMessage("FAIL - unexpected secureConnectionStart value of " +
+    entry.secureConnectionStart + " does not equal " + entry.fetchStart, "*");
+}
+window.top.postMessage("PASS", "*");
+</script>
diff --git a/testing/web-platform/tests/navigation-timing/secure-connection-start-reuse.https.html b/testing/web-platform/tests/navigation-timing/secure-connection-start-reuse.https.html
new file mode 100644
index 0000000000000..f52a259ecd425
--- /dev/null
+++ b/testing/web-platform/tests/navigation-timing/secure-connection-start-reuse.https.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8" />
+<title>Navigation Timing secureconnectionstart reuse</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+const t = async_test("Test that secureConnectionStart value is as expected when reused");
+window.addEventListener("message", t.step_func_done(e => {
+  assert_equals(e.data, "PASS");
+}));
+</script>
+<iframe src="resources/secure-connection-interim.html">
+
