2. In-depth understanding of floating and positioning

Floating and positioning

1. There are a few notes on absolute positioning:

1) The use of absolute positioning is offset by its "nearest" "ancestor element" of an "already positioned". If there is no ancestor element that has been positioned, the browser window will be the base of the offset;

2) If the parent element is not set to be positioned, the child tag is set to absolute positioning, without setting left and top, then the child element will stay where it is, but this element is out of standard flow. This is a great way to get away from the standard flow of elements that remain motionless.

　　

2. In-depth understanding of floating and positioning