docs: function focusBinding (event) {
          this._hasFocus = true;
          var cb;
          if (this._hasPlaceholder) {
              cb = this._setCaretForPlaceholder;
          } else if (this._cfg.autoselect) {
              cb = this._autoselect;
          }
  
          if (cb) {
              ariaCoreTimer.addCallback({
                  fn : cb,
                  scope : this,
                  delay : 4
              });
          }
  
      }