Summary & Key Takeaways ​

• Modern CSS enables building scrollspy navigation without JavaScript.
• The tutorial uses scroll-target-group and :target-current properties.
• It leverages anchor positioning for highlighting the current section.
• This approach simplifies a common UI pattern.
• It reduces reliance on IntersectionObserver and complex JS.

Our Commentary ​

This is exactly the kind of thing we love to see. Pushing more UI logic into CSS, reducing JavaScript overhead, and simplifying development. scroll-target-group and :target-current are powerful additions. It's a great example of how the web platform is evolving to make common patterns easier and more performant.