I am a big fan of CSS Naked Day and have been participating myself the last two occasions. Earlier this year I open sourced a JavaScript project that on April 9th strips away your CSS entirely from the browser.
That covers the bases for us Jekyll and other static site generator users. Since I am an old time Drupal developer it was only natural to port this library there, in the form of a module.
Please say hello to naked.module for Drupal 7!
Naked.module was originally developed by Brent Hardinge. With feedback from Neftalí Guerrero I made a quick port to Drupal 7, removing a lot of complexity on the way by having the module only include CSSNakedDay.js.
So, will your Drupal site join us in celebrating the semantic web a few months from now?