项目 范例 说明 ! [if !IE] The NOT operator. This is placed immediately in front of the _feature_, _operator_, or _subexpression_ to reverse the Boolean meaning of the expression. NOT运算符.这是摆立即在前面的_功能_,_操作员_,或_子表达式_扭转布尔表达式的意义. lt [if lt IE 5.5] The less-than…