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<!DOCTYPE html>
<meta charset="utf-8">
<title>Focus Navigation for the radio group</title>
<link rel="author" href="mailto:zhoupeng.1996@bytedance.com">
<link rel="help" href="https://issues.chromium.org/issues/421837104">
<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>
<script src="/resources/testdriver-actions.js"></script>
<script src="resources/focus-utils.js"></script>
<input type="text" id="start">
<form>
<input type="radio" name="radio" id="a">
<input type="radio" name="radio" id="b">
</form>
<input type="text" id="end">
<script>
const c = document.createElement('input');
c.type = 'radio';
c.name = 'radio';
c.checked = true;
promise_test(async () => {
start.focus();
assert_equals(document.activeElement, start);
await navigateFocusForward();
assert_equals(document.activeElement, a);
// Append checked radio element.
document.querySelector('form').appendChild(c);
await navigateFocusForward();
assert_equals(document.activeElement, c);
await navigateFocusForward();
assert_equals(document.activeElement, end);
await navigateFocusBackward();
assert_equals(document.activeElement, c);
await navigateFocusBackward();
assert_equals(document.activeElement, start);
}, 'Focus the new checked radio in the focused radio group.');
promise_test(async () => {
assert_true(c.checked);
a.focus();
assert_equals(document.activeElement, a);
}, 'Focusable radio can be focused even with a checked radio in the group.');
promise_test(async () => {
start.focus();
assert_equals(document.activeElement, start);
assert_true(c.checked);
await navigateFocusForward();
assert_equals(document.activeElement, c);
await navigateFocusForward();
assert_equals(document.activeElement, end);
await navigateFocusBackward();
assert_equals(document.activeElement, c);
await navigateFocusBackward();
assert_equals(document.activeElement, start);
}, 'Focus the checked radio in the group.');
promise_test(async () => {
a.focus();
assert_equals(document.activeElement, a);
// Set as the checked radio.
b.checked = true;
assert_false(c.checked);
await navigateFocusForward();
assert_equals(document.activeElement, b);
await navigateFocusForward();
assert_equals(document.activeElement, end);
await navigateFocusBackward();
assert_equals(document.activeElement, b);
await navigateFocusBackward();
assert_equals(document.activeElement, start);
}, 'Focus the checked radio in the focused radio group.');
promise_test(async () => {
b.checked = false;
start.focus();
await navigateFocusForward();
assert_equals(document.activeElement, a);
await navigateFocusForward();
assert_equals(document.activeElement, end);
await navigateFocusBackward();
assert_equals(document.activeElement, a);
await navigateFocusBackward();
assert_equals(document.activeElement, start);
}, 'When `checked` is false on a radio element, focus navigation target the radio group first element.');
</script>
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