Citadel is from 2011, but this doesn't matter, the point is that you can do stuff like that on the web.
> doesn't work on my Vulkan aware mobile GPU
If the GPU is Vulkan aware then it might be an issue with your browser, though from [0] it looks like only Apple's devices do not support it - which wouldn't support Vulkan either, so i'm not sure why you'd bring that up.
Citadel is from 2011, but this doesn't matter, the point is that you can do stuff like that on the web.
> doesn't work on my Vulkan aware mobile GPU
If the GPU is Vulkan aware then it might be an issue with your browser, though from [0] it looks like only Apple's devices do not support it - which wouldn't support Vulkan either, so i'm not sure why you'd bring that up.
[0] https://caniuse.com/webgl2