How Browsers Work — 40-Second JS Animation
Addy Osmani
@addyosmani · 424.8K followersClaude Opus 5.5 drew every frame of this 40-second explainer animation in JavaScript — no external assets, just canvas calls. A kawaii robot mascot walks through the full browser pipeline: typing a URL, DNS lookup, HTTP fetch, HTML parsing, render tree, paint. Each stage gets its own illustrated scene with hand-drawn-style clouds, a retro laptop shell, and step counters in the corner. It's the kind of CS explainer that actually makes you want to watch it twice.
- Every animation frame hand-coded in JavaScript by Claude Opus 5.5 — no sprite sheets or video
- Covers the full browser pipeline from URL entry to paint in just 40 seconds
- Charming kawaii art style with a robot mascot, sketchy clouds, and retro browser chrome
“Claude Opus 5.5 drew each frame of this animation in JavaScript. Here's "how browsers work" in 40 seconds.”
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