该元素需指定一个子元素(默认为a元素),作用于主元素。
See the Pen .twinkle-borderdraw by iRuxu (@iRuxu) on CodePen.
See the Pen twinkle-borderTop by iRuxu (@iRuxu) on CodePen.
See the Pen twinkle-borderBottom by iRuxu (@iRuxu) on CodePen.
See the Pen twinkle-glimpse by iRuxu (@iRuxu) on CodePen.