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    <title>aria_activedescendant_valid - Accessibility Checker Help</title>
    <script>
        RULE_MESSAGES = {"en-US":{"Pass_0":"Rule Passed","Fail_1":"The 'aria-activedescendant' property is empty","Fail_2":"The 'aria-activedescendant' property references a hidden node","Fail_3":"Element is not a combobox, and the referenced active-descendant element is not a valid descendant","Fail_4":"Element is a combobox, and the referenced active-descendant element is not