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    <title>combobox_focusable_elements - Accessibility Checker Help</title>
    <script>
        RULE_MESSAGES = {"en-US":{"Pass":"DOM focus is allowed only on the combobox element as required","Fail_not_tabbable":"The combobox element does not allow DOM focus as required","Fail_tabbable_child":"The popup of the combobox has DOM focus or has 'aria-activedescendant' defined, which is not allowed","group":"Tabbable focus for the combobox must be allowed only on the t