1 files changed, 34 insertions, 0 deletions
diff --git a/testing/web-platform/tests/navigation-api/navigation-methods/traverseTo-after-adding-iframe.html b/testing/web-platform/tests/navigation-api/navigation-methods/traverseTo-after-adding-iframe.html
new file mode 100644
index 0000000000..0289c455f1
--- /dev/null
+++ b/testing/web-platform/tests/navigation-api/navigation-methods/traverseTo-after-adding-iframe.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+async_test(t => {
+  let start_length = navigation.entries().length;
+
+  // Wait for after the load event so that the navigation doesn't get converted
+  // into a replace navigation.
+  window.onload = () => t.step_timeout(() => {
+    navigation.navigate("#top");
+    assert_equals(navigation.entries().length, start_length + 1);
+
+    let i = document.createElement("iframe");
+    i.src = "/common/blank.html";
+    document.body.appendChild(i);
+    i.onload = () => t.step_timeout(() => {
+      assert_equals(i.contentWindow.navigation.entries().length, 1);
+      i.contentWindow.navigation.navigate("#fragment");
+      assert_equals(i.contentWindow.navigation.entries().length, 2);
+      i.contentWindow.navigation.back().committed.then(t.step_func(() => {
+        assert_equals(i.contentWindow.navigation.entries().length, 2);
+        assert_equals(i.contentWindow.navigation.currentEntry.index, 0);
+        return i.contentWindow.navigation.forward().committed;
+      })).then(t.step_func_done(() => {
+        assert_equals(i.contentWindow.navigation.entries().length, 2);
+        assert_equals(i.contentWindow.navigation.currentEntry.index, 1);
+      }));
+    }, 0);
+  }, 0);
+}, "navigation.traverseTo() should work in an iframe that is not present in all history entries");
+</script>
+</body>