HTML怎么设置双实线（html怎么加一条水平虚线）

双实线：.<pstyle=border-style:double>双线式边框</p>如：.cc{border:4px#39Fdouble;}其它：<pstyle=border-style:none>无边框</p><pstyle=border-style:dotted>点线式边框</p><pstyle=border-style:dashed>破折线式边框</p><pstyle=border-style:solid>直线式边框</p><pstyle=border-style:double>双线式边框</p><pstyle=border-style:groove>槽线式边框</p><pstyle=border-style:ridge>脊线式边框</p><pstyle=border-style:inset>内嵌效果的边框</p><pstyle=border-style:outset>突起效果的边框</p>