If the mmedium is the message then the users choice may affect how your message is received.

Web style sheets are a form of separation of presentation and content for web design in which the markup of a webpage contains the page's verbal message and structure, but does not define its visual layout (style). Instead, the style is defined in an separate stylesheet file using a language such as CSS. This design approach is identified as a "separation" because it supersedes the traditional methodology in which a page's markup contained information both style and structure.

The benefits of delivering the information separately include: faster, more easily maintained, more accessible, more customised, consistent and portable contents.