code: function() {
              if (this.animateClearButton && this.animateWithCss3) {
                  return this.clearButtonEl.hasCls(this.clearButtonCls + '-on');
              }
  
              // This should not be necessary (see Element.setVisible/isVisible), but else there is confusion about visibility
              // when moving the mouse out and _quickly_ over then input again.
              var cachedVisible = Ext.core.Element.data(this.clearButtonEl.dom, 'isVisible');
              if (typeof(cachedVisible) == 'boolean') {
                  return cachedVisible;
              }
              return this.clearButtonEl.isVisible();
          }
docs: Small wrapper around clearButtonEl.isVisible() to handle setVisible animation that may still be in progress.