When you browse web pages, you often see various shapes, such as circles, squares, rectangles, triangles, etc. Today I specially made a tutorial on using CSS to implement triangles. How to write CSS triangles? Woolen cloth? What is the principle of implementing triangles in css?
Recommended Manual: css Online Manual
Please take a look at the detailed examples.
(Related video tutorial recommendation: CSS tutorial)
css3 triangle usage scenario
We know that one special effect is a span drop-down list. That is to say, when the mouse is placed on a div, the originally hidden content or secondary menu will appear. Such a drop-down list will highlight a small triangle pointing to the original div area block, as shown in the figure:
So let’s summarize now how we write these triangles.
CSS3 triangle implementation principle
In css3, we mainly use a transparent attribute, which means transparent. For example, we will If the font is set to black, we will write color: black. If we want to set the font color to transparent, we can write color: transparent. In the same way, background-color:transparent can set the background to be transparent.
8 classifications of triangles
We divide triangles into 8 types according to their position:
triangle up,triangle down,triangle left,triangle right,triangle top left,triangle top right,triangle bottom left和triangle bottom right。
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8 Examples of Triangle Implementation
1.triangle up upper triangle
#triangle-up{ width:0; height:0; border-left:50px solid transparent; border-right:50px solid transparent; border-bottom:100px solid black; }
2.triangle down lower triangle
#triangle-down{ width:0; height:0; border-left:50px solid transparent; border-right:50px solid transparent; border-top:100px solid black; }
3.triangle left left triangle
#triangle-left{ width:0; height:0; border-top:50px solid transparent; border-bottom:50px solid transparent; border-right:100px solid black; }
4.triangle right right triangle
#triangle-right{ width:0; height:0; border-top:50px solid transparent; border-bottom:50px solid transparent; border-left:100px solid black; }
5.triangle top left upper left triangle
#triangle-topleft{ width:0; height:0; border-top:100px solid black; border-right:100px solid transparent; }
6.triangle top right upper right triangle
#triangle-topright{ width:0; height:0; border-top:100px solid black; border-left:100px solid transparent; }
7.triangle bottom left lower left triangle
#triangle-bottomleft{ width:0; height:0; border-bottom:100px solid black; border-right:100px solid transparent; }
8 .triangle bottom right Lower right triangle
#triangle-bottomright{ width:0; height:0; border-bottom:100px solid black; border-left:100px solid transparent; }
The approximate effect is as shown in the figure:
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