Browser APIs

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1. 01 Detect Online/Offline Easy
2. 02 Visibility Change Handler Easy
3. 03 Web Share API Button Easy
4. 04 Fullscreen API Toggle Easy
5. 05 Battery Status Indicator Easy
6. 06 LocalStorage Wrapper with Expiry Medium
7. 07 URL State Sync (searchParams) Medium
8. 08 Undo/Redo History Manager Medium
9. 09 Clipboard Manager Medium
10. 10 IntersectionObserver Lazy Load Medium
11. 11 ResizeObserver Responsive Component Medium
12. 12 Keyboard Shortcut Manager Medium
13. 13 Drag & Drop with HTML5 DnD API Medium
14. 14 Detect Idle User Medium
15. 15 Detect Network Speed Medium
16. 16 Geolocation Tracker Medium
17. 17 Notification API Wrapper Medium
18. 18 requestAnimationFrame Animation Loop Medium
19. 19 Copy Rich Content to Clipboard Medium
20. 20 Page Visibility Auto-pause Video Medium
21. 21 Intersection-based Analytics (impressions) Medium
22. 22 IndexedDB CRUD Wrapper Hard
23. 23 Sync State Across Tabs (BroadcastChannel) Hard
24. 24 MutationObserver DOM Watcher Hard
25. 25 Web Audio Visualizer Hard
26. 26 getUserMedia Camera Capture Hard
27. 27 Screen Recorder (MediaRecorder) Hard
28. 28 Service Worker Offline Cache Hard
29. 29 Web Worker Heavy Computation Hard
30. 30 Virtual Scroll with rAF Hard
31. 31 History API Router Hard
32. 32 File System Access API Save Hard
33. 33 Intersection Observer Lazy Loader - Core Implementation Easy
34. 34 Intersection Observer Lazy Loader - Accessibility & Responsive Edition Medium
35. 35 Intersection Observer Lazy Loader - Performance-Optimized Edition Hard
36. 36 Mutation Observer Logger - Core Implementation Easy
37. 37 Mutation Observer Logger - Accessibility & Responsive Edition Medium
38. 38 Mutation Observer Logger - Performance-Optimized Edition Hard
39. 39 Resize Observer Layout - Core Implementation Easy
40. 40 Resize Observer Layout - Accessibility & Responsive Edition Medium
41. 41 Resize Observer Layout - Performance-Optimized Edition Hard
42. 42 Web Worker Task Queue - Core Implementation Easy
43. 43 Web Worker Task Queue - Accessibility & Responsive Edition Medium
44. 44 Web Worker Task Queue - Performance-Optimized Edition Hard
45. 45 Service Worker Offline Cache - Core Implementation Easy
46. 46 Service Worker Offline Cache - Accessibility & Responsive Edition Medium
47. 47 Service Worker Offline Cache - Performance-Optimized Edition Hard
48. 48 IndexedDB Notes App - Core Implementation Easy
49. 49 IndexedDB Notes App - Accessibility & Responsive Edition Medium
50. 50 IndexedDB Notes App - Performance-Optimized Edition Hard
51. 51 Clipboard API Tool - Core Implementation Easy
52. 52 Clipboard API Tool - Accessibility & Responsive Edition Medium
53. 53 Clipboard API Tool - Performance-Optimized Edition Hard
54. 54 Geolocation Tracker - Core Implementation Easy
55. 55 Geolocation Tracker - Accessibility & Responsive Edition Medium
56. 56 Geolocation Tracker - Performance-Optimized Edition Hard
57. 57 WebSocket Chat Client - Core Implementation Easy
58. 58 WebSocket Chat Client - Accessibility & Responsive Edition Medium
59. 59 WebSocket Chat Client - Performance-Optimized Edition Hard
60. 60 File System Access Explorer - Core Implementation Easy
61. 61 File System Access Explorer - Accessibility & Responsive Edition Medium
62. 62 File System Access Explorer - Performance-Optimized Edition Hard