How I make motion videos with Claude Opus 5.5 (the full setup, prompts and numbers)

One HTML file where every frame is a function of time, captured by Playwright and encoded with ffmpeg. Steps: set up the rig, load your real site instead of redrawn UI, swap adjectives for numbers, ban defaults by name, review stills and contact sheets, score sound, export for X. Ends with a hype check and other routes such as Blender.

Disclosure Maker's own product: the example film is for the author's app, Slabwatch.