HTML5 Masterclass (2026 Edition)
📌 Covered in this course:
HTML Overview · Syntax · Links & Nav · Lists & Tables · Images & Responsive srcset · SVG & Canvas · Semantic HTML5 · Forms & Inputs · Audio, Video & IFrames · Metadata & SEO · Accessibility & ARIA · Web Storage · Data Attributes · Dialogs · Web Workers · Templates & Web Components · Internationalization · Responsive HTML · Performance · Validation & Debugging
🎯 Complete 37-Chapter HTML5 Masterclass
Choose where to start: explore core HTML basics, master forms, configure Head Metadata & SEO, test ARIA accessibility, build Web Components, or run live code in our interactive editor:
📚 Master Course Curriculum
Phase 01
HTML Introduction
Phase 02
HTML Syntax and Text
03
3. Elements, Tags & AttributesVoid Elements · Global Attributes (id, class, style)
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04
4. Headings & ParagraphsHeadings <h1>-<h6> · <p> · <br> · <hr>
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05
5. Text Formatting<strong>, <em>, <mark>, <sub>, <sup>, <blockquote>, <abbr>
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06
6. Code & Technical Text<code>, <pre>, <kbd>, <samp>, <var>, Entities
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Phase 03
Links and Navigation
Phase 04
Lists and Tables
Phase 05
Images and Graphics
Phase 06
Semantic HTML5
Phase 07
Forms and Input Controls
16
16. Forms Basics<form>, action, method (GET/POST), <label>, <input>, <button>, <textarea>
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17
17. Input Typestext, password, email, number, tel, date, color, range, checkbox, radio, file
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18
18. Form Attributesrequired, readonly, disabled, min/max, pattern Regex, autocomplete, multiple
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19
19. Form ValidationNative validation, novalidate, ValidityState API, checkValidity(), CSS :invalid
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Phase 08
Audio, Video and Embeds
20
20. Audio<audio>, controls, autoplay, loop, muted, <source> formats, Audio API
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21
21. Video<video>, poster, <source> formats, <track> WebVTT subtitles, responsive aspect ratio
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22
22. Embedded Content<iframe>, YouTube & Maps embedding, title, loading="lazy", sandbox security
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Phase 09
Metadata and SEO
Phase 10
Accessibility and ARIA
25
25. Accessibility BasicsAssistive tech, semantic HTML foundation, keyboard nav, screen readers, focus order, skip links
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26
26. ARIAARIA roles, aria-label, aria-labelledby, aria-expanded, aria-hidden, aria-live, when NOT to use ARIA
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27
27. Accessibility TestingKeyboard-only testing, screen reader audits, DevTools, color contrast ratios, Lighthouse audits
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Phase 11
HTML APIs and Browser Features
28
28. Web StoragelocalStorage, sessionStorage, setItem(), getItem(), JSON serialization, storage events, security
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29
29. Data Attributesdata-* attributes, dataset API, storing IDs & UI state, CSS attribute selectors
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30
30. Dialogs & Interactive Elements<details>, <summary>, <dialog>, showModal(), close(), <meter>, <progress>
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31
31. Web Workers & Offline FeaturesWeb Workers multi-threading, postMessage(), Service Workers, Cache API, PWA manifest
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Phase 12
Advanced HTML5
32
32. Templates & Custom Elements<template>, cloneNode(), Custom Elements lifecycle, Shadow DOM, <slot>
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33
33. Web ComponentsCustom Elements, Shadow DOM encapsulation, Templates, Slots, Web Components vs frameworks
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34
34. Internationalizationlang attribute, dir="ltr"/"rtl", date/time markup, multi-language nav, Unicode UTF-8
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Phase 13
Responsive and Production HTML
35
35. Responsive HTMLViewport meta, responsive images, mobile-first markup, responsive tables/forms, touch targets
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36
36. HTML PerformanceMinification, lazy loading, defer/async, preload/preconnect, reducing DOM size, Core Web Vitals
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37
37. Validation & DebuggingW3C Validation, DevTools Elements/Console, broken links, accessibility audit, production checklist
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❓ Frequently Asked Questions (FAQ)
Q Can I create a website using only HTML?
Yes, HTML can construct a complete web page independently. However, without CSS it will appear as unstyled plain text, and without JavaScript it will lack dynamic interactivity.
Q What are Web Components in HTML5?
Web Components are a suite of native browser technologies (Custom Elements, Shadow DOM, HTML Templates) that allow developers to create custom, reusable HTML tags with encapsulated CSS styles without requiring frameworks like React or Vue.
Q What is the difference between script async and script defer?
async downloads the script in background and executes it immediately upon download completion (interrupting HTML parsing). defer downloads the script in background but waits until HTML parsing is 100% complete before executing, preserving execution order.