This is a minimal MDX post. If you can read this on /blog/hello-world, the build worked 🎉.

Introduction

A short section to demonstrate the Table of Contents. You should see a Contents box on the left (desktop) or above (mobile).

What you can test

• Headings (##, ###) appear in TOC.
• Footnotes like this¹ render below.
• Code blocks show a Copy button:

export function add(a: number, b: number) {
  return a + b;
}