This rule states that the output of the webserver shall be solely raw HTML and CSS. No fancy-pants frameworks or templating engines allowed. Just good ol' fashioned, no-nonsense, code-it-yourself, make-it-work, make-it-look-good HTML and CSS.
Why? Because, as the great Neo-Bruin once said, "If it's not broke, don't fix it. If it's not raw, don't add a framework."
Related Subpages: Rule 2: High-Contrast Color Scheme Rule 3: Thick Black Borders Rule 4: Harsh Drop Shadows Rule 5: Bold, Unsmoothed Typography