[CSS 3] Add a Cutout Notch to an HTML Element with a CSS Polygon Clip-Path

In this lesson, we'll learn how to use CSS Clip Path to add a notch

clip-path: polygon(
　　0% 10%, 10% 0%, /*topleft*/
　　92% 0, 100% 8%, /*top right*/
　　100% 85%, 85% 100%, /*bottom right*/
　　8% 100%, 0% 92% /*bottom left*/
); 

Each edge has two point to define the position.