If the medium is the message then the user’s choice may affect how your message is received.
The benefits of delivering information separately:
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Style sheets are a way of separating presentation and content, where the markup of a webpage contains its verbal message and structure, but doesn’t define its visual layout or style.
Instead, the style is defined in an separate file, using CSS.
This design approach is identified as a ‘separation’ because it supersedes the traditional methodology in which a page’s markup contains both style and structure information.