I don't think it's possible. At the end of the day, the browser (user) determines if and how any given piece of markup will be rendered. There are server side h

I don't think it's possible. At the end of the day, the browser (user) determines if and how any given piece of markup will be rendered. There are server side hacks of course, but those are still relying on the user's agent to reply to them a certain way. As long as the web is based mostly on HTML, the blockers win.