1 files changed, 48 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-focusing-steps-inert.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-focusing-steps-inert.html
new file mode 100644
index 0000000000..003c456179
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-focusing-steps-inert.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Test focusing steps when dialog is inert</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<input id="outer-input">
+<dialog>
+  <input autofocus>
+</dialog>
+<script>
+function test_focusing_steps_with_inert_dialog(test, isModal) {
+  const outerInput = document.querySelector("#outer-input");
+  outerInput.focus();
+  assert_equals(document.activeElement, outerInput,
+    "Focus should be on element we just focused");
+
+  const dialog = document.querySelector("dialog");
+  assert_false(dialog.open, "Dialog should initially be closed");
+
+  dialog.inert = true;
+  test.add_cleanup(() => { dialog.inert = false; });
+
+  if (isModal) {
+    dialog.showModal();
+    test.add_cleanup(() => { dialog.close(); });
+    assert_equals(document.activeElement, document.body,
+      "dialog.showModal(): focusing steps should apply focus fixup rule when dialog is inert");
+  } else {
+    dialog.show();
+    test.add_cleanup(() => { dialog.close(); });
+    assert_equals(document.activeElement, outerInput,
+      "dialog.show(): focusing steps should not change focus when dialog is inert");
+  }
+}
+
+test(function() {
+  test_focusing_steps_with_inert_dialog(this, false);
+}, "dialog.show(): focusing steps should not change focus when dialog is inert");
+
+test(function() {
+  test_focusing_steps_with_inert_dialog(this, true);
+}, "dialog.showModal(): focusing steps should apply focus fixup rule when dialog is inert");
+</script>
+</body>
+</html>