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html

HTML

Semantic markup, accessibility, forms, and the document object model.

Mode
iframe_html
Practice
HTML preview sandbox
Lessons
58 units

Reference desk

Lookup tags, global attributes, events, encodings, and HTTP basics alongside the lesson track.

Open HTML reference →

Before you start

HyperText Markup Language—the semantic skeleton of web pages: structure, accessibility, forms, and media.

Every web UI and email-like document starts with markup; bad HTML breaks SEO, assistive tech, and CSS layouts.

Websites, hybrid apps, email templates, design systems, and CMS-driven content.

Long lesson track with iframe HTML playgrounds, MCQs, and an optional HTML reference desk.

First hands-on web track—before or in parallel with CSS; required foundation for JavaScript DOM work.

Lesson order

Sequential — follow top to bottom

58 lessons are live in this track. Start from step 01 for the smoothest path.

  1. 01 intro Introduction to HTML

    beginner

    Open →
  2. 02 editors Editors and workflow

    advanced

    Open →
  3. 03 basics HTML basics

    advanced

    Open →
  4. 04 elements HTML elements

    advanced

    Open →
  5. 05 attributes HTML attributes

    advanced

    Open →
  6. 06 headings Headings and sections

    advanced

    Open →
  7. 07 paragraphs Paragraphs and line breaks

    advanced

    Open →
  8. 08 inline-styles Inline styles and presentation

    advanced

    Open →
  9. 09 formatting Text formatting

    advanced

    Open →
  10. 10 quotations Quotations and citations

    advanced

    Open →
  11. 11 comments Comments

    advanced

    Open →
  12. 12 colors Colors in HTML history and today

    advanced

    Open →
  13. 13 html-and-css How HTML and CSS work together

    advanced

    Open →
  14. 14 links Links and URLs

    beginner

    Open →
  15. 15 images Images

    beginner

    Open →
  16. 16 favicon Favicon

    advanced

    Open →
  17. 17 head Document head

    advanced

    Open →
  18. 18 tables Tables

    beginner

    Open →
  19. 19 lists Lists

    beginner

    Open →
  20. 20 block-inline Block and inline elements

    advanced

    Open →
  21. 21 div-span Div and span

    advanced

    Open →
  22. 22 classes The class attribute

    advanced

    Open →
  23. 23 id-attribute The id attribute

    advanced

    Open →
  24. 24 buttons Buttons

    advanced

    Open →
  25. 25 iframes Iframes

    advanced

    Open →
  26. 26 scripts HTML and JavaScript

    advanced

    Open →
  27. 27 file-paths File paths

    advanced

    Open →
  28. 28 layout Page layout with HTML

    advanced

    Open →
  29. 29 responsive Responsive HTML

    advanced

    Open →
  30. 30 code-elements Computer code in HTML

    advanced

    Open →
  31. 31 semantics Semantics

    advanced

    Open →
  32. 32 style-guide HTML conventions

    advanced

    Open →
  33. 33 entities Character references

    advanced

    Open →
  34. 34 symbols Symbols in HTML

    advanced

    Open →
  35. 35 emoji Emoji

    advanced

    Open →
  36. 36 charsets Character encodings

    advanced

    Open →
  37. 37 url-encode URL encoding

    advanced

    Open →
  38. 38 html-vs-xhtml HTML vs XHTML

    advanced

    Open →
  39. 39 forms Forms

    intermediate

    Open →
  40. 40 form-attributes Form attributes

    advanced

    Open →
  41. 41 form-elements Form elements

    advanced

    Open →
  42. 42 input-types Input types

    advanced

    Open →
  43. 43 input-attributes Input attributes

    advanced

    Open →
  44. 44 canvas Canvas

    advanced

    Open →
  45. 45 svg SVG in HTML

    advanced

    Open →
  46. 46 media Media overview

    intermediate

    Open →
  47. 47 video Video

    advanced

    Open →
  48. 48 audio Audio

    advanced

    Open →
  49. 49 plugins-object Plugins and object

    advanced

    Open →
  50. 50 embedded-youtube Embedding YouTube

    advanced

    Open →
  51. 51 web-apis HTML and Web APIs

    advanced

    Open →
  52. 52 geolocation Geolocation

    advanced

    Open →
  53. 53 drag-and-drop Drag and drop

    advanced

    Open →
  54. 54 web-storage Web storage

    advanced

    Open →
  55. 55 web-workers Web Workers

    advanced

    Open →
  56. 56 sse Server-Sent Events

    advanced

    Open →
  57. 57 accessibility Accessibility

    advanced

    Open →
  58. 58 summary Course summary

    beginner

    Open →