1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/shadow-dom/focus/focus-scroll-under-delegatesFocus.html b/testing/web-platform/tests/shadow-dom/focus/focus-scroll-under-delegatesFocus.html
new file mode 100644
index 0000000000..ea5fc472b5
--- /dev/null
+++ b/testing/web-platform/tests/shadow-dom/focus/focus-scroll-under-delegatesFocus.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel="help" href="https://issues.chromium.org/issues/324112201">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<div id=container style="border:1px solid red; width: 100px;">
+  <template shadowrootmode=open shadowrootdelegatesfocus>
+    <slot></slot>
+  </template>
+
+  <a id=anchor href="#heading">anchor</a>
+  <div style="height:2000px"></div>
+  <h1 id=heading>Heading</h1>
+</div>
+
+<script>
+promise_test(async (t) => {
+  t.add_cleanup(() => container.remove());
+  let scrolled = new Promise(resolve => {
+    document.addEventListener('scrollend',resolve,{once:true});
+  })
+  await test_driver.click(anchor);
+  await scrolled;
+
+  scrolled = false;
+  document.addEventListener('scroll',() => {
+    scrolled = true;
+  });
+  await test_driver.click(heading);
+  await new Promise(resolve => t.step_timeout(resolve, 500));
+  assert_false(scrolled,'The document should not scroll');
+},'delegatesFocus shouldn\'t cause extra focus steps');
+</script>