A cascading style sheet is a set of rules that specify how a web browser displays text on an HTML page. The advantages of CSS instead of HTML formatting are as follows:

• The style is controlled in one central location, and changes are automatically applied to all HTML pages.
• It provides better separation of text and formatting tags making it easier for translating the content into other languages.
• The file size of each HTML page is smaller (sometimes by 50% or more). Therefore, documents can load more quickly.
• Accessibility is improved.