Not a video. Not a GIF. Every pixel below is computed 60×/second by a fragment shader Skia compiled at runtime — move your cursor through it.
The whole image is a single piece of GPU code — a fragment shader written in SkSL, Skia's shading language. It is handed to Skia as a plain string and compiled to native GPU instructions at runtime, then run once per pixel, every frame.
The HTML5 Canvas 2D API has no equivalent — it can draw shapes, gradients and
images, but it cannot run your own per-pixel code. Skia ships the shader compiler
itself: CanvasKit.RuntimeEffect.Make(sksl). The flowing field here is
domain-warped fractal noise; your cursor feeds a live uniform into it.