How to Use CSS to implement small triangles and css to implement triangles

How to Use CSS to implement small triangles and css to implement triangles

How to Use CSS to achieve small triangles:
Among the many web page effects, there are applications with small triangle effects, which can increase the aesthetics of specific applications. The following is an example code, this section describes two ways to achieve the effect of a small triangle. The Code is as follows:

<! DOCTYPE html> 
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