1 files changed, 43 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/editing/the-hidden-attribute/hidden-until-found-002.html b/testing/web-platform/tests/html/editing/the-hidden-attribute/hidden-until-found-002.html
new file mode 100644
index 0000000000..a454e3a009
--- /dev/null
+++ b/testing/web-platform/tests/html/editing/the-hidden-attribute/hidden-until-found-002.html
@@ -0,0 +1,43 @@
+<!doctype HTML>
+<meta charset="utf8">
+<title>Content Visibility: tab order navigation ignores hidden=until-found subtrees</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+<meta name="assert" content="tab order navigation ignores hidden=until-found subtrees.">
+
+<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>
+
+<input id=one type=text></input>
+<div hidden=until-found>
+  <input id=two type=text></input>
+  <input id=three type=text></input>
+  <input id=four type=text></input>
+</div>
+<input id=five type=text></input>
+
+<script>
+async_test((t) => {
+  const tab = "\t";
+  async function step1() {
+    await test_driver.send_keys(document.body, tab);
+    t.step(() => {
+      assert_equals(document.activeElement, document.getElementById("one"));
+    });
+    requestAnimationFrame(step2);
+  }
+
+  async function step2() {
+    await test_driver.send_keys(document.body, tab);
+    t.step(() => {
+      assert_equals(document.activeElement, document.getElementById("five"));
+    });
+    t.done();
+  }
+
+  window.onload = () => { requestAnimationFrame(step1); };
+}, "Tab order navigation skips hidden=until-found subtrees");
+</script>