1 files changed, 28 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/invalid-after-clone.html b/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/invalid-after-clone.html
new file mode 100644
index 0000000000..92345602a8
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/invalid-after-clone.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<meta charset="utf-8">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<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>
+<input>
+<textarea></textarea>
+<script>
+promise_test(async () => {
+  for (let tag of ["input", "textarea"]) {
+    let element = document.querySelector(tag);
+    await test_driver.send_keys(element, 'something');
+
+    assert_true(element.validity.valid, tag + ' should be valid');
+
+    element.maxLength = 0;
+    assert_true(element.matches(":invalid"), tag + ' should match :invalid');
+    assert_false(element.validity.valid, tag + ' should be invalid');
+
+    let clone = element.cloneNode(true);
+    assert_true(clone.matches(":invalid"), tag + ' clone should match :invalid');
+    assert_false(clone.validity.valid, tag + 'clone should be invalid');
+  }
+}, 'Cloned invalid inputs / textareas with interactive changes get their validity state copied correctly');
+</script>