8 Modules · 24 Lessons · Interactive
TAGGED.
HTML for AI Builders

The language every AI assistant writes. Learn it properly — and start shipping AI-powered interfaces that actually work.

8Modules
24Lessons
20+Simulations
~4hTotal
index.html 
<section id="hero">

  <h1>Build with AI</h1>

  <p>HTML is the map
  AI navigates.</p>

  <button
    class="cta"
    onclick="ask()"
  >Ask AI</button>

</section>

/* "Add a nav to header" */
// AI finds it instantly ✓
What you'll learn
From zero to AI-powered interfaces

Four skills you'll use in every project after this course.

Read & write HTML fluently

Every tag, attribute, and nesting relationship — so AI-generated code is never a mystery.

Prompt AI with precision

Use HTML structure in your prompts to get production-ready code on the first try — not the fifth.

Connect HTML to AI APIs

Wire a live input to an AI endpoint and stream responses into the DOM — under 30 lines of code.

Debug AI-generated code fast

Spot the 5 mistakes AI makes every time and fix them in seconds before they hit production.

Full Curriculum
8 modules. 24 lessons. All interactive.

Click any module to see its lessons — then jump straight in.

1
What is HTML, Really?
The foundation AI reads before writing a single line
3 lessons~30 min
▼
1.1
HTML in Plain English
~10 min
1.2
How AI Reads HTML
~10 min
1.3
Your First Tagged Page
~10 min
2
Semantic HTML & Why It Matters
Give AI the context it needs to help you precisely
3 lessons~30 min
▼
2.1
Semantic vs Generic
~10 min
2.2
Accessibility = AI Context
~10 min
2.3
Structure Your Content
~10 min
3
Prompting AI with HTML Context
Get production-ready code on the first try
3 lessons~30 min
▼
3.1
Context Changes Everything
~10 min
3.2
Paste Smart, Get Better Results
~10 min
3.3
The Prompt–HTML Loop
~10 min
4
The DOM: HTML's Living Tree
Navigate the structure AI traverses on every edit
3 lessons~30 min
▼
4.1
What the DOM Actually Is
~10 min
4.2
Parent, Child, Sibling
~10 min
4.3
How AI Navigates the DOM
~10 min
5
HTML for AI-Powered Interfaces
Build the scaffolding for real AI-connected apps
3 lessons~30 min
▼
5.1
Forms as AI Inputs
~10 min
5.2
Dynamic HTML Patterns
~10 min
5.3
Responsive Layouts the AI Way
~10 min
6
Connecting HTML to AI APIs
Wire your HTML to live AI services
3 lessons~30 min
▼
6.1
How Fetch Works
~10 min
6.2
HTML + API = AI App
~10 min
6.3
Handling AI Responses in the DOM
~10 min
7
Reading & Debugging AI-Generated HTML
Catch the predictable mistakes AI makes before they bite
3 lessons~30 min
▼
7.1
Spot the Mistakes AI Makes
~10 min
7.2
DevTools Are Your Superpower
~10 min
7.3
Fix It Fast
~10 min
8
Putting It All Together
Ship a full AI-connected page with everything you've learned
3 lessons~30 min
▼
8.1
The AI-HTML Workflow
~10 min
8.2
Build a Full Page with AI
~10 min
8.3
What to Learn Next
~10 min

Ready to get TAGGED?

Join the developers who prompt smarter, build faster, and understand every line AI writes for them.

 Module 1
What is HTML, Really?
The foundation AI reads before writing a single line
Lesson 1.1
HTML in Plain English
⏱ ~10 min

HTML stands for HyperText Markup Language. You wrap content in labels — called tags — that describe what it is. An AI reads those labels like a map before it edits anything on your page.

0
% of pages use HTML
0
standard elements
0
year invented
0
current version
Tag Anatomy — Click each colored part
< a href = "https://claude.ai" > Ask Claude </a>
👆 Click any colored section above
Lesson 1.2
How AI Reads HTML
⏱ ~10 min

When you paste HTML into an AI assistant, it doesn't "see" a rendered page — it reads the raw structure. Tags, attributes, and nesting depth are the signals it uses to make precise edits without guessing.

💡
The AI reads your structure
Semantic, well-structured HTML means AI can follow instructions like "add a button after the h2 in the hero section" accurately on the first try.
AI Perspective — Hover each element
HTML
<section id="hero">
  <h1>Welcome</h1>
  <p>Build with AI</p>
  <button class="cta">Start</button>
</section>

👆 Hover the teal tags to see what AI reads

🤖 AI is reading...
← Hover a highlighted tag in the code block
Lesson 1.3
Your First Tagged Page
⏱ ~10 min

Click elements below to add them to your page. Watch the live preview and HTML source update in real time — the same way AI builds a page: one element at a time.

Live DOM Builder

👁 Preview

← Add elements above

📄 Generated HTML

Practice: Write Your First HTML Page

Type HTML in the editor below and watch it render live. Complete each challenge to unlock the next one.

1Hello World
2Add a <p>
3Add a link
4Add a button
5Full page
🎯
Challenge 1
index.html
Live Preview 0 chars
Module 1 of 8
 Module 2
Semantic HTML & Why It Matters
Give AI the context it needs to help you precisely
Lesson 2.1
Semantic vs Generic
⏱ ~10 min

Semantic HTML uses elements that describe their meaning, not just their appearance. Instead of wrapping everything in <div>, you use <header>, <nav>, <article>, <footer>. This gives AI a vocabulary to navigate your page precisely — and saves you from hours of back-and-forth.

🎯
Why this matters for AI
When you say "add a link to the navigation" — AI needs to know which element IS the navigation. Semantic tags make that obvious. Without them, AI guesses.
Div Soup vs Semantic HTML — See the Difference
❌ Div Soup — AI has to guess
HTML
<div class="top">
  <div class="logo">...</div>
  <div class="links">...</div>
</div>
<div class="stuff">
  <div>...</div>
</div>
❌ AI prompt: "Add a search bar to the navigation"
AI doesn't know which <div> IS the nav. It guesses wrong.
✅ Semantic — AI navigates instantly
HTML
<header>
  <h1>Logo</h1>
  <nav>...</nav>
</header>
<main>
  <article>...</article>
</main>
✅ AI prompt: "Add a search bar to the nav"
AI finds <nav> instantly. First-try accuracy.
Semantic Layout Hotspots — Click each number
A Semantic Page Layout
<header>
<nav>
<main>
<footer>
1
2
3
4
← Click the numbered hotspots
Semantic Elements — Click to explore each one
<header>
Top bar
Logo & nav
<nav>
Navigation
Link groups
<main>
Core zone
Primary content
<article>
Self-contained
Post or card
<section>
Thematic
Related content
<aside>
Secondary
Sidebar
<footer>
Bottom
Links & copyright
<figure>
Media
Image + caption
← Click an element above
Lesson 2.2
Accessibility = AI Context
⏱ ~10 min

Accessibility attributes like alt, aria-label, and role aren't just for screen readers — they're context signals for AI. When you add alt="Product dashboard showing revenue chart", an AI now knows exactly what that image shows, even though it can't see it.

Alt Text & ARIA Playground — Edit and see AI's understanding
alt=
aria-label=
🧠
The richer the alt text, the smarter the AI
Compare "alt=screenshot" vs "alt=Dashboard showing monthly revenue chart with 42% growth". The second lets AI write intelligent captions, summaries, and descriptions without asking you.
Lesson 2.3
Structure Your Content
⏱ ~10 min

Now that you know every semantic element, let's test your ability to spot the right one for the job — and then fix some broken HTML.

Semantic Quiz — Which element belongs here?

Fix the Broken HTML — Click the wrong element to replace it

This AI-generated page uses the wrong elements in 4 places. Click each wrong element to fix it with the correct semantic tag.

🔧 Click wrong elements to fix

📋 Fixed: 0 / 4

Semantic HTML Checklist — Before You Prompt AI

Check these boxes before pasting your HTML into an AI assistant. Better structure = better results.

Is the page wrapped in <header>, <main>, and <footer>?
Are navigation links inside a <nav> element?
Is the primary content inside <main>?
Do all images have descriptive alt= text?
Do all buttons and inputs have labels?
Are blog posts or cards wrapped in <article>?
Are sections grouped with <section> and/or id attributes?
0 / 7
Module 2 of 8
Module 3
Prompting AI with HTML Context
Get production-ready AI code on the first try, every time.
🔒 Full Course Required
Module 3: Prompting AI with HTML Context
Get production-ready AI code on the first try, every time. Enroll in the full TAGGED. course to unlock all 8 modules and the complete interactive experience.
3.1Context Changes Everything
3.2Paste Smart, Get Better Results
3.3The Prompt-HTML Loop
🚀 Get Full Access
Module 3 of 8
Module 4
The DOM: HTML's Living Tree
Navigate the structure AI traverses on every edit.
🔒 Full Course Required
Module 4: The DOM: HTML's Living Tree
Navigate the structure AI traverses on every edit. Enroll in the full TAGGED. course to unlock all 8 modules and the complete interactive experience.
4.1What the DOM Actually Is
4.2Parent, Child & Sibling
4.3How AI Navigates the DOM
🚀 Get Full Access
Module 4 of 8
Module 5
HTML for AI-Powered Interfaces
Build the scaffolding for real AI-connected apps.
🔒 Full Course Required
Module 5: HTML for AI-Powered Interfaces
Build the scaffolding for real AI-connected apps. Enroll in the full TAGGED. course to unlock all 8 modules and the complete interactive experience.
5.1Forms as AI Inputs
5.2Dynamic HTML Patterns
5.3Responsive AI Layouts
🚀 Get Full Access
Module 5 of 8
Module 6
Connecting HTML to AI APIs
Wire your HTML directly to live AI services.
🔒 Full Course Required
Module 6: Connecting HTML to AI APIs
Wire your HTML directly to live AI services. Enroll in the full TAGGED. course to unlock all 8 modules and the complete interactive experience.
6.1How Fetch Works
6.2HTML + API = AI App
6.3Handling AI Responses
🚀 Get Full Access
Module 6 of 8
Module 7
Reading & Debugging AI HTML
Catch the predictable mistakes AI makes before they ship.
🔒 Full Course Required
Module 7: Reading & Debugging AI HTML
Catch the predictable mistakes AI makes before they ship. Enroll in the full TAGGED. course to unlock all 8 modules and the complete interactive experience.
7.1Spot AI Mistakes
7.2DevTools Are Your Superpower
7.3Fix It Fast
🚀 Get Full Access
Module 7 of 8
Module 8
Putting It All Together
Ship a complete, production-ready AI-connected page.
🔒 Full Course Required
Module 8: Putting It All Together
Ship a complete, production-ready AI-connected page. Enroll in the full TAGGED. course to unlock all 8 modules and the complete interactive experience.
8.1The AI-HTML Workflow
8.2Build a Full Page with AI
8.3What to Learn Next
🚀 Get Full Access
Module 8 of 8