本文详细介绍了如何使用纯CSS来创建各种方向的三角形，包括向上、向下、向左及向右等不同方位的三角形绘制方法。通过调整边框颜色和透明度，可以轻松实现这些形状，并且不需要额外的图片资源。
Triangle Up
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#triangle-up
{ width: 0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-bottom: 100px solid red;} |
Triangle Down
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#triangle-down
{ width: 0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-top: 100px solid red;} |
Triangle Left
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#triangle-left { width: 0; height: 0; border-top: 50px solid transparent; border-right: 100px solid red; border-bottom: 50px solid transparent;} |
Triangle Right
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#triangle-right { width: 0; height: 0; border-top: 50px solid transparent; border-left: 100px solid red; border-bottom: 50px solid transparent;} |
Triangle Top Left
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#triangle-topleft
{ width: 0; height: 0; border-top: 100px solid red; border-right: 100px solid transparent;} |
Triangle Top Right
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#triangle-topright
{ width: 0; height: 0; border-top: 100px solid red; border-left: 100px solid transparent;} |
Triangle Bottom Left
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#triangle-bottomleft
{ width: 0; height: 0; border-bottom: 100px solid red; border-right: 100px solid transparent;} |
Triangle Bottom Right
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#triangle-bottomright
{ width: 0; height: 0; border-bottom: 100px solid red; border-left: 100px solid transparent;} |
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