Table of Contents

1. Headings

H1

H2

H3

H4

H5

H6

2. Text Formatting

Bold
Italic
Bold + Italic
Strikethrough
Inline code
Alt+F4 for secret message

3. Lists

Unordered Lists

• Item 1
• Item 2
• Item 3
  • Item 3.1
  • Item 3.2
    • Item 3.2.1
    • Item 3.2.2

Ordered Lists

1. Item 1
2. Item 2
3. Item 3
   1. Item 3.1
   2. Item 3.2
      1. Item 3.2.1
      2. Item 3.2.2

Task Lists

• Task 1
• Task 2
• Task 3

4. Links

Best website in world ↗
Best website in world ↗
Internal navigation: Go to the headings section

5. Images

6. Code Blocks

Inline

console.log("Hello World")

Block

interface Config {
  port: number;
  host: string;
}

function createServer(config: Config): void {
  console.log(`Starting server on ${config.host}:${config.port}`);
  console.log(`🚀 Server running at ${config.host}:${config.port}`);
}app.ts

// Test for overflow and line highlighting
const veryLongVariableNameThatMightBreakTheLayoutOnMobileDevicesIfNotHandledCorrectlyWithOverflowScroll = "test";

7. Tables

8. Blockquotes

This is a quote

Quote

Nested quote

9. Horizontal Rule

10. Details

11. Footnotes

This statement needs a citation¹. Here’s another reference².

12. Callouts (Custom MDX Components)

13. HTML inside MDX (Allowed)

14. Emojis (subtle use)

This is acceptable 🙂
This is not 🚀🔥💯❌

15. Embeds

16. Typography & Rhythm

Abbreviations & Fine Print

The HTML specification is maintained by the W3C. This ensures that tags like

Deep List Nesting (Level 5)

1. Level 1
   1. Level 2
      1. Level 3
         1. Level 4
            1. Level 5
               1. Level 6
               2. Level 6
            2. Level 4
         2. Level 3
      2. Level 2
   2. Level 1

• Level 1: Main Topic
  • Level 2: Sub-topic
    • Level 3: Detail
      • Level 4: Specific point
        • Level 5: The “Inception” level - is this still readable?
        • Level 5: Another deep point.
      • Level 4: Back up one.
    • Level 3: Back up two.

Long Paragraph (Readability & Line Height)

This block tests your line-height and margin-bottom between paragraphs. A good “reading rhythm” usually requires a line-height of 1.5 to 1.7. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Curabitur pretium tincidunt lacus. Nulla gravida orci a odio. Nullam varius, turpis et commodo pharetra, est eros bibendum elit, nec luctus magna felis sollicitudin mauris. Integer in mauris eu nibh euismod gravida. Duis ac tellus et risus vulputate vehicula. Donec lobortis risus a elit. Etiam tempor. Ut ullamcorper, ligula eu tempor congue, eros est euismod turpis, id tincidunt sapien risus a quam. Maecenas fermentum consequat mi. Donec fermentum. Pellentesque malesuada nulla a mi. Duis sapien sem, aliquet nec, commodo eget, consequat quis, neque. Aliquam faucibus, elit ut dictum aliquet, felis nisl adipiscing sapien, sed malesuada diam lacus eget erat. Cras mollis scelerisque nunc. Nullam arcu. Aliquam consequat. Curabitur augue lorem, dapibus quis, laoreet et, pretium ac, nisi. Aenean magna nisl, mollis quis, molestie eu, feugiat in, orci. In hac habitasse platea dictumst. This statement needs some context* This is the explanation that appears on hover. to be understood.
The algorithm has O(n²) complexity which can be problematic* Quadratic time complexity means the execution time grows proportionally to the square of the input size. for large datasets.

Mixed Content Density

Testing how a bold phrase followed by a code tag and a Link ↗ looks when crammed into a single line of text to ensure the “line-box” doesn’t jump in height.

Note on Density: Here is a line with Strong Text, Italic Text, inline-code, and a Link ↗ all in one sentence to see if the vertical spacing remains consistent.

17. Definition Lists

Term 1

Definition 1

Term 2

Definition 2

18. Superscript and Subscript

X^2^ or X² H2O or H₂O

19. Escape Characters

*Not italic* [Not a link]

20. Line Breaks

Line 1 Line 2 (two spaces at end)

Line 1
Line 2 (backslash)

21. Auto-linked URLs

https://www.example.com ↗ (without brackets)

22. Comments

23. HTML Entities

© ® ™ & < > ” ’