1 files changed, 29 insertions, 0 deletions
diff --git a/testing/web-platform/tests/navigation-api/scroll-behavior/after-transition-explicit-scroll.html b/testing/web-platform/tests/navigation-api/scroll-behavior/after-transition-explicit-scroll.html
new file mode 100644
index 0000000000..4b7d075474
--- /dev/null
+++ b/testing/web-platform/tests/navigation-api/scroll-behavior/after-transition-explicit-scroll.html
@@ -0,0 +1,29 @@
+<!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);
+  await navigation.navigate("#frag").finished;
+  assert_not_equals(window.scrollY, 0);
+  navigation.onnavigate = t.step_func(e => {
+    e.intercept({
+      scroll: "after-transition",
+      handler: t.step_func(() => {
+        assert_not_equals(window.scrollY, 0);
+        e.scroll();
+        assert_equals(window.scrollY, 0);
+      })
+    });
+  });
+  await navigation.back().finished;
+  assert_equals(window.scrollY, 0);
+}, "scroll: scroll() should preempt after-transition");
+</script>
+</body>