W3C Example of Inline Form Validation

var taken_usernames = ['timbl', 'shadi', 'yatil', 'bim', 'shawn', 'slh', 'spacebear13', 'Obelisks', 'Phoenix', 'Imari', 'Henry', 'Zeki', 'Rome', 'Min', ' Kelly', 'Brynn'];