1 files changed, 32 insertions, 0 deletions
diff --git a/testing/web-platform/tests/navigation-api/navigation-methods/disambigaute-back.html b/testing/web-platform/tests/navigation-api/navigation-methods/disambigaute-back.html
new file mode 100644
index 0000000000..d44d435896
--- /dev/null
+++ b/testing/web-platform/tests/navigation-api/navigation-methods/disambigaute-back.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<iframe id="i" src="/common/blank.html"></iframe>
+<script>
+async_test(t => {
+  // Wait for after the load event so that the navigation doesn't get converted
+  // into a replace navigation.
+  window.onload = () => t.step_timeout(() => {
+    assert_equals(navigation.entries().length, 1);
+    assert_equals(i.contentWindow.navigation.entries().length, 1);
+    navigation.navigate("#top");
+    assert_equals(navigation.entries().length, 2);
+    assert_equals(i.contentWindow.navigation.entries().length, 1);
+    i.contentWindow.navigation.navigate("#1");
+    assert_equals(navigation.entries().length, 2);
+    assert_equals(i.contentWindow.navigation.entries().length, 2);
+    assert_equals(navigation.currentEntry.index, 1);
+    assert_equals(i.contentWindow.navigation.currentEntry.index, 1);
+    assert_true(navigation.canGoBack);
+    assert_true(i.contentWindow.navigation.canGoBack);
+
+    // There are 2 joint session history entries containing the iframe's
+    // previous key. Navigate to the nearest one (which navigates the iframe
+    // but not the top window).
+    i.contentWindow.navigation.back().committed.then(t.step_func_done(() => {
+      assert_equals(navigation.currentEntry.index, 1);
+      assert_equals(i.contentWindow.navigation.currentEntry.index, 0);
+    }));
+  }, 0);
+}, "navigation.back() goes to the nearest back entry");
+</script>