CSS-position positioning

Positioning and flow independent of document elements

• absolute

1. From the original position to locate

2. The relative positioning of the nearest parent to locate, if not, then the relative positioning of the document.

• relative

1. Retain the original position to position

2. Their original position relative positioning

• fixed

1. The relative positioning of the browser window is fixed

• sticky viscous positioning

1. It acts like a relative; when the page is scrolled beyond the target area, it behaves like a fixed

2. You must specify top, right, one of the bottom, or left, four threshold