tl;dr for dummies

If you need to include "tl;dr" at any point in a blog post for the sake of readers you think might not care to sit through the entire thing, you probably should take what you've written back to your desk and shorten it.

Occam's razor, brevity is the soul of wit, keep it simple, stupid, et al.

Or, you can state your case, or proposition, or manifesto in the opening paragraph, like good writers have been doing for thousands of years.