Useful CSS Properties

Basic Concepts
Grouping

One or more selectors separated by commas. Grouping allows you to assign styles to multiple elements (selectors). All four heading tags below will be purple.

H1, H2, H3, H5 {color: purple;}

http://www.designseo.com/Useful-CSS-Properties-with-Examples

Contextual selectors

One or more selectors delimited by spaces. The example rule indicates the bold markup will be red only while enclosed in H1 tags.H1 B {color: red;}

This is red.

This is not.

Class

Class selectors may be used as an attribute to a tag. A class selector is a string preceded by a period. Do not use the period when referencing the class. Do not begin a class name with a number, although IE4/5 let you get away with it.

.example {color: red;}

This is an example in red.

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