text-transform controls capitalization of text. When writing HTML, you have a choice to do capitalization in the HTML itself or using CSS.

Values

capitalize
Capitalizes the first character of each word. Take note that other characters that are not the first characters in each word will not be affected in any way.
uppercase
All characters will be transformed to uppercase counterparts.
lowercase
All characters will be transformed to lowercase counterparts.
none
No changes will be made.

Example

<p style="text-transform:uppercase;">Everything here will be capitalized.</p>
<p style="text-transform:lowercase;">Everything here will be changed to lowercase.</p>
<p style="text-transform:capitalize;">Only The First Letters of Each word will be Capitalized.</p>