File: radio-focus-navigation-disabled.html

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<!DOCTYPE html>
<link rel="author" href="mailto:dizhangg@chromium.org">
<link rel="help" href="http://crbug.com/427520278">
<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>

<form>
 <label><input type="radio" name="start" id="start">Outside form</label>
</form>
<form>
 <label><input type="radio" name="radio" id="a" disabled checked>disabled checked</label>
 <label><input type="radio" name="radio" id="b">enabled 1</label>
 <label><input type="radio" name="radio" id="c">enabled 2</label>
</form>
<form>
 <label><input type="radio" name="end" id="end">Outside form</label>
</form>

<script>

promise_test(async () => {
    start.focus();
    assert_equals(document.activeElement, start);
    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);
}, 'Should be able to tab focus in radio group even when the checked radio button is disabled.');
</script>