How to center a floated element? How to center an absolutely positioned div?

How to center a floating element? How to center an absolutely positioned div?

div centering:

border: 1px solid red;
margin: 0 auto; 
height: 50px;
width: 80px;

Floating elements are centered up, down, left and right:

border: 1px solid red;
float: left;
position: absolute;
width: 200px;
height: 100px;
left: 50%;
top: 50%;
margin: -50px 0 0 -100px;

Absolutely positioned left and right centering:

border: 1px solid black;
position: absolute;
width: 200px;
height: 100px;
margin: 0 auto;
left: 0;
right: 0;

Recommended tutorial: css Quick Start

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