Summary of four methods of position positioning in css

This article talks about the four methods of position positioning in cssSummary

##1. positon: static; StaticPositioning (Default )

All elements in the standard document flow are statically positioned

2. positon:relative; Relative positioning

　Does not deviate from the standard document flow, "leave a hole in the hometown, separate the shadows"

Features: If set Relative positioning and setting the

top, left, right, bottom attributes, then the box will be Offset the original position

Purpose of relative positioning: Generally not used for "capping effect", only two functions:

　(1) Fine-tuning elements

(2) Reference for

absolute positioning, the son must be the same as the father

You can use left and right to describe the right and left offset of the box; you can use top and bottom to describe the bottom and top of the box Offset

position：relative；
top：10px;
left：10px;   //相对于原来位置向右下移10px

position：relative;
top:-10px;
left:-10px;   //相对于原来位置向左上移10px

3. position:absolute; Absolute positioning

　Out of the standard document flow

Features: (1) If this element has no parent element, then top, left, right, and bottom will be positioned relative to the browser window in the future (2) If the absolutely positioned element has a parent element, but the parent element is not relatively positioned, then top, left, right, and bottom are still positioned relative to the browsing window at this time

(3) If the absolutely positioned element has a parent element, and the parent element has positioning (non-static), then the offset of the absolutely positioned element is based on its own parent element

　　　　 (4) After absolute positioning The element will not occupy a position on the page

4. position:fixed; Fixed positioning

Departing from the standard document flow

The purpose of fixed positioning: Some small advertisements on the page need to be fixed at a fixed position on the page.

Summary: When writing pages in the future, the most commonly used ones are neither absolute positioning nor absolute positioning. Relative positioning, but absolute positioning and relative positioning are used together

Specification: The child must be the same as the parent (child elements use absolute positioning, and parent elements use relative positioning)

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