Replit — We Built a Video Rendering Engine by Lying to the Browser About What Time It Is
SMRTR summary
Replit built a web page to video renderer that makes browsers deterministic by replacing JavaScript time APIs with a virtual clock. The system captures arbitrary web content by monkey-patching setTimeout, requestAnimationFrame, and Date APIs, ensuring animations render at perfect framerates regardless of actual rendering speed. Complex workarounds handle video elements through five-layer transcoding and audio through Web Audio API interception.
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