The Ultimate Frontend Guide: Create a Zero-Dependency Dynamic Table of Contents (TOC) with Scroll Spy

Tired of manually creating tables of contents for long articles? This guide shows you how to build a fully functional, dynamic Table of Contents (TOC) for your Markdown-based articles using native JavaScript. We'll explore two main approaches: a zero-dependency vanilla JS solution and an integration with the popular tocbot library. You'll learn to auto-generate a TOC from H2 headings, implement smooth scroll navigation, and efficiently create a scroll-spying highlight effect using IntersectionObserver, significantly enhancing your site's user experience.