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What’s the embedded ShaderToy supposed to look like? When I press play and wait, nothing happens for over a minute.

This post would benefit greatly from a couple screenshots of failed tests.

it starts grey, then you see the outline of a sphere, background fades in, a red, blue, and white sphere appear around the central grey/white sphere, the scene fades back to grey, then the red and blue sphere come back and you can see the reflections or whatever on the central sphere, but you can't tell it's a sphere since it's "faded in to the background".

I believe it requires webgl. Can you confirm whether your browser has webgl enabled?

Regular Chrome and Safari on a regular iPhone

Also tried it out in both up-to-date Chrome and Safari on my up-to-date MacBook, which can play everything on https://webglsamples.org/ just fine, but on this page, nothing happens.

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