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curtainsjs
curtains.js is a lightweight vanilla WebGL javascript library that turns HTML DOM elements into interactive textured planes.
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If you're purely wanting to add a shader effect then as a newcomer to the shader world I'd recommend curtainsjs as an easy way to add custom shaders without the hassle of having to deal with low level WebGL setup stuff. They even have a similar example with the mouse distortion effect where the code is much more readable and well commented with another codepen by the creator of curtains which has a more similar mouse flow effect that could be repurposed to be a post effect shader and distort the output of a gradient shader.