text: (function(window) {
      if (!window || !window.document) {
        return;
      }
    
      GhostKeyboard({
        input: document.getElementById('en_input'),
        lang: 'en'
      });
    
      GhostKeyboard({
        input: document.getElementById('en_pattern_input'),
        lang: 'en',
        pattern: /[a-zA-Z0-9.@]/
      });
    
      GhostKeyboard({
        input: document.getElementById('ko_input'),
        lang: 'ko'
      });
    })(this);