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                ## 用純 CSS 創建一個三角形的原理是什么? ```css 采用的是相鄰邊框連接處的均分原理。 將元素的寬高設為0,只設置 border ,把任意三條邊隱藏掉(顏色設為 transparent),剩下的就是一個三角形。 #demo { width: 0; height: 0; border-width: 20px; border-style: solid; border-color: transparent transparent red transparent; } ```
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                              哎呀哎呀视频在线观看