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WebGL is a Javascript API for rendering interactive 3D / 2D graphics on the HTML5 canvas element. It is based on OpenGL ES 2.0.

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Why is this shader using multiple render targets not working?

It seems that you have a WebGL version 1 (OpenGL ES 2.0) and that's why it does not accept OpenGL ES 3.x features. … Review the code where you request the context for WebGL var gl = canvas.getContext("webgl2"); // 2! If you are requesting WebGL2, check that there are no whitespaces before #version 300 es. …
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