Update AppHistory navigate event behavior for traversals

Follows WICG/navigation-api#178 * Always fire navigate event for traversals (currently, we fire it for all same-document traversals and for cross-document appHistory.goTo(), but not cross-document traversals from the legacy history API, or from the UI). * The AppHistory navigate event should never be cancelable for traversals. Previously, it was cancelable for renderer-initiated traversals, but this has the potential to cause problems in the case where multiple frames are navigating and one frame (but not all) cancels. That frame would be out of sync with the authoritative history state in the browser process. Change-Id: I92a3ee0f908acc04c31dc9b8ec57569bd66b4bc7
web-platform-tests · Nov 1, 2021 · a5f4f5f · a5f4f5f
1 parent 5e22630
commit a5f4f5f
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Showing 6 changed files with 39 additions and 6 deletions.
diff --git a/app-history/navigate-event/navigate-appHistory-back-cross-document.html b/app-history/navigate-event/navigate-appHistory-back-cross-document.html
@@ -11,7 +11,7 @@
     i.onload = t.step_func(() => {
       i.contentWindow.appHistory.onnavigate = t.step_func_done(e => {
         assert_equals(e.navigationType, "traverse");
-        assert_true(e.cancelable);
+        assert_false(e.cancelable);
         assert_false(e.canTransition);
         assert_false(e.userInitiated);
         assert_false(e.hashChange);

diff --git a/app-history/navigate-event/navigate-appHistory-back-same-document.html b/app-history/navigate-event/navigate-appHistory-back-same-document.html
@@ -11,7 +11,7 @@
     appHistory.navigate("#foo").committed.then(t.step_func(() => {
       appHistory.onnavigate = t.step_func_done(e => {
         assert_equals(e.navigationType, "traverse");
-        assert_true(e.cancelable);
+        assert_false(e.cancelable);
         assert_true(e.canTransition);
         assert_false(e.userInitiated);
         assert_true(e.hashChange);

diff --git a/app-history/navigate-event/navigate-history-back-after-fragment.html b/app-history/navigate-event/navigate-history-back-after-fragment.html
@@ -12,7 +12,7 @@
 
     appHistory.onnavigate = t.step_func_done(e => {
       assert_equals(e.navigationType, "traverse");
-      assert_true(e.cancelable);
+      assert_false(e.cancelable);
       assert_true(e.canTransition);
       assert_false(e.userInitiated);
       assert_true(e.hashChange);

diff --git a/app-history/navigate-event/navigate-history-back-after-pushState.html b/app-history/navigate-event/navigate-history-back-after-pushState.html
@@ -12,7 +12,7 @@
 
     appHistory.onnavigate = t.step_func_done(e => {
       assert_equals(e.navigationType, "traverse");
-      assert_true(e.cancelable);
+      assert_false(e.cancelable);
       assert_true(e.canTransition);
       assert_false(e.userInitiated);
       assert_false(e.hashChange);

diff --git a/app-history/navigate-event/navigate-history-back-cross-document.html b/app-history/navigate-event/navigate-history-back-cross-document.html
@@ -0,0 +1,31 @@
+<!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 => {
+  window.onload = t.step_func(() => {
+    let target_key = i.contentWindow.appHistory.current.key;
+    let target_id = i.contentWindow.appHistory.current.id;
+    i.contentWindow.appHistory.navigate("?foo");
+    i.onload = t.step_func(() => {
+      i.contentWindow.appHistory.onnavigate = t.step_func_done(e => {
+        assert_equals(e.navigationType, "traverse");
+        assert_false(e.cancelable);
+        assert_false(e.canTransition);
+        assert_false(e.userInitiated);
+        assert_false(e.hashChange);
+        assert_equals(new URL(e.destination.url).pathname, "/common/blank.html");
+        assert_false(e.destination.sameDocument);
+        assert_equals(e.destination.key, target_key);
+        assert_equals(e.destination.id, target_id);
+        assert_equals(e.destination.index, 0);
+        assert_equals(e.formData, null);
+        assert_equals(e.info, undefined);
+      });
+      assert_true(i.contentWindow.appHistory.canGoBack);
+      i.contentWindow.history.back();
+    })
+  });
+}, "navigate event for history.back() - cross-document");
+</script>
diff --git a/app-history/navigate/return-value/goTo-cross-document-preventDefault.html b/app-history/navigate/return-value/goTo-cross-document-preventDefault.html
@@ -20,8 +20,10 @@
   assert_equals(i.contentWindow.appHistory.entries().length, 2);
   assert_equals(i.contentWindow.appHistory.current, i.contentWindow.appHistory.entries()[1]);
 
+  // This will be a noop, because navigate events are uncancelable for traversals.
   i.contentWindow.appHistory.onnavigate = e => e.preventDefault();
 
-  await assertBothRejectDOM(t, i.contentWindow.appHistory.goTo(key), "AbortError", i.contentWindow);
-}, "goTo() promise rejection when preventDefault()ing the navigate event (cross-document)");
+  assertNeverSettles(t, i.contentWindow.appHistory.goTo(key), i.contentWindow);
+  await new Promise(resolve => i.onload = () => t.step_timeout(resolve, 0));
+}, "goTo() promise never settle when preventDefault()ing the navigate event (cross-document)");
 </script>