1 files changed, 43 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/forms/the-selectlist-element/tab-closes-listbox.tentative.html b/testing/web-platform/tests/html/semantics/forms/the-selectlist-element/tab-closes-listbox.tentative.html
new file mode 100644
index 0000000000..1706ed34cc
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/the-selectlist-element/tab-closes-listbox.tentative.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/openui/open-ui/issues/599">
+<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1359089">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<selectlist id=defaultlistbox>
+  <option>one</option>
+  <option>two</option>
+</selectlist>
+
+<selectlist id=customlistbox>
+  <listbox>
+    <option>one</option>
+    <option>two</option>
+  </listbox>
+</selectlist>
+
+<script>
+const tabKey = '\uE004';
+
+document.querySelectorAll('selectlist').forEach(selectlist => {
+  promise_test(async () => {
+    selectlist.focus();
+    await test_driver.send_keys(selectlist, ' ');
+    assert_true(selectlist.open, 'Listbox should be open after pressing space.');
+
+    selectlist.addEventListener('keydown', event => {
+      if (event.key === 'Tab') {
+        event.preventDefault();
+      }
+    }, {once: true});
+    await test_driver.send_keys(document.activeElement, tabKey);
+    assert_true(selectlist.open, 'Listbox should stay open when the tab keydown is preventDefaulted.');
+
+    await test_driver.send_keys(document.activeElement, tabKey);
+    assert_false(selectlist.open, 'Listbox should close after pressing the tab key.');
+  }, `${selectlist.id}: Pressing tab should close the listbox.`);
+});
+</script>