How to make sharp corners in css3

How to make sharp corners in css3: First create an HTML sample file; then determine the position of the sharp corners; finally, set the attributes of the specified div to "top:6px;left:-3px;border-top:0px ;border-bottom..." to achieve the sharp corner effect.

The operating environment of this tutorial: windows7 system, css3 version, thinkpad t480 computer.

Recommended: "css video tutorial"

The sharp corners are on top

Rendering:

##Code:

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The sharp corners are underneath

Rendering:

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The sharp corner is on the left
Rendering:

Code:

The sharp corner is on the right
Rendering :

#Code:

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