CSS Variables A New Hope
summary
Claims that CSS custom properties are accessible at runtime to JavaScript, demonstrates a clip-path spotlight from four SVG circles and builds a galaxy made of ~250 stars using HTML/CSS plus minimal JS. Shows concrete perf numbers: a naïve DOM-iterating version drops to ~24 fps, the CSS‑variable approach hits ~75 fps while a non-variable DOM animation reaches ~58–59 fps. Notes expensive pseudo-element filters, uses DeviceOrientation over WebSocket and an Audio‑API emoji meter; some demos require compromises.
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chapters (8)
- 0:00Introduction
- 4:40CSS variables changed workflow
- 5:50Spotlight effect with SVG
- 9:03Runtime access in JavaScript
- 11:59Galaxy animation performance
- 16:45CSS animation challenges
- 19:55Device APIs declaratively
- 25:11Emoji happiness meter
