JavaScript Device Detection
summary
Compares responsive design versus device detection, argues user agent strings are unreliable and numerous — roughly 30k user agent variants — while feature detection misses OS and human-experience limits. Demonstrates image handling with the picture element and an image engine/wful proxy resizing workflow that caches and serves device‑specific images, notes the need for server tooling and human cropping for good thumbnails, and shows the demo detection endpoint working against real devices.
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chapters (9)
- 0:00Device detection intro
- 6:46User agent limits
- 13:43Simple JS detection
- 19:06Responsive vs detection
- 27:26Mobile-first critiques
- 35:01Beyond responsive design
- 41:24Image management challenges
- 47:05ImageEngine intro
- 51:18Live demo: ImageEngine
