1 files changed, 60 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/child-sequential-focus.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/child-sequential-focus.html
new file mode 100644
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--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/child-sequential-focus.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/pull/8199">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<dialog autofocus id=autofocusdialog data-description="dialog element with autofocus should get initial focus." class=target>
+  <button>focusable button</button>
+  <button autofocus>autofocusable button</button>
+</dialog>
+
+<dialog id=keyboardfocusdialog data-description="Only keyboard-focusable elements should get dialog initial focus.">
+  <button tabindex="-1">mouse focusable button</button>
+  <button class=target>keyboard focusable button</button>
+</dialog>
+
+<dialog id=autofocuswithoutkeyboarddialog data-description="Autofocus takes precedence over keyboard-focusable requirement.">
+  <button>keyboard focusable button</button>
+  <button tabindex="-1" autofocus class=target>mouse focusable autofocus button</button>
+</dialog>
+
+<dialog id=subtree data-description="Only keyboard-focusable elements should get dialog initial focus including in subtrees.">
+  <div>
+    <button tabindex="-1">mouse focusable button</button>
+    <button class=target>keyboard focusable button</button>
+  </div>
+</dialog>
+
+<dialog id=nestedbuttons data-description="Only keyboard-focusable elements should get dialog initial focus including in nested buttons.">
+  <button tabindex="-1">
+    <span>mouse focusable button</span>
+    <button tabindex="-1">nested mouse focusable button</button>
+  </button>
+  <button class=target>keyboard focusable button</button>
+</dialog>
+
+<script>
+document.querySelectorAll('dialog').forEach(dialog => {
+  test(t => {
+    let target = dialog.querySelector('.target');
+    if (dialog.classList.contains('target')) {
+      target = dialog;
+    }
+    t.add_cleanup(() => {
+      if (dialog.open)
+        dialog.close();
+    });
+
+    dialog.showModal();
+    assert_equals(document.activeElement, target,
+      'showModal: the target element did not receive initial focus.');
+    dialog.close();
+
+    dialog.show();
+    assert_equals(document.activeElement, target,
+      'show: the target element did not receive initial focus.');
+    dialog.close();
+  }, dialog.dataset.description);
+});
+</script>