Styles and Stylesheets

Styles are used to control the look and feel of your documentation, and keep the content separate from its presentation. The styling is based on cascading stylesheets (CSS), which is an international standard for formatting web content, developed by the World Wide Web Consortium (or W3C).

As much as possible, you should avoid the opposite of styles, which is local formatting. For example, you can highlight some text and make it italic right where that content exists. But if you make that same change in many places, it takes a lot longer and it's a lot more work to control the look of that content if you later change your mind.