What are the length units in the CSS?

This time for everyone to bring the CSS in what length units, using the length of the CSS in the unit notes what, the following is the actual case, together to see.

1. There are two types of length units: relative and absolute. Relative length units Specify a unit relative to the other length properties. Style sheets with relative units are easier to scale based on different output environments

Relative units are:

EM: ' font-size ' for related fonts

Ex: ' x-height ' for related fonts

The ' em ' unit equals the computed value of the ' font-size ' property of the element that applies the rule. An exception is when ' em ' appears in the value of the ' Font-size ' property itself, in which case the font size of the parent element is referenced. It can be used in vertical or horizontal measurements.

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