1 files changed, 32 insertions, 0 deletions
diff --git a/testing/web-platform/tests/navigation-api/scroll-behavior/after-transition-change-history-scroll-restoration-during-promise.html b/testing/web-platform/tests/navigation-api/scroll-behavior/after-transition-change-history-scroll-restoration-during-promise.html
new file mode 100644
index 0000000000..6ededdeebf
--- /dev/null
+++ b/testing/web-platform/tests/navigation-api/scroll-behavior/after-transition-change-history-scroll-restoration-during-promise.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<div style="height: 1000px; width: 1000px;"></div>
+<div id="frag"></div>
+<script>
+promise_test(async t => {
+  // Wait for after the load event so that the navigation doesn't get converted
+  // into a replace navigation.
+  await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
+  assert_equals(window.scrollY, 0);
+
+  history.scrollRestoration = "manual";
+  await navigation.navigate("#frag").finished;
+  assert_not_equals(window.scrollY, 0);
+
+  let intercept_resolve;
+  navigation.onnavigate = e => {
+    e.intercept({ handler: () => new Promise(r => intercept_resolve = r),
+                  scroll: "after-transition" });
+  };
+
+  let back_promises = navigation.back();
+  await back_promises.committed;
+  history.scrollRestoration = "auto";
+  intercept_resolve();
+  await back_promises.finished;
+  assert_equals(window.scrollY, 0);
+}, "scroll: after-transition should ignore history.scrollRestoration even if it changes in the middle of the navigation");
+</script>
+</body>