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-rw-r--r--testing/web-platform/tests/navigation-api/navigation-methods/disambigaute-back.html32
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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
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+++ 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>