Summary & Key Takeaways ​

• Josh explains the "header blocker" pattern — a technique to prevent content from awkwardly peeking under a sticky header.
• The implementation turns out to be simpler than expected, using positioning and pseudo-elements.
• The effect is invisible when done right, but the jank is obvious when it's missing.

Our Commentary ​

This is one of those polish details that separates sites that feel finished from ones that feel rushed. The sticky header content-bleed problem is everywhere, and most sites just ignore it. Josh's explanations are usually worth reading even if you think you know the technique — his interactive demos tend to reveal edge cases you hadn't considered.