I try to move the project from 5.2 to the latest 5.3 build, but materials on WebGL build look terrible and browser shows log in the console:
OPENGL LOG: Creating OpenGL ES 2.0 graphics device UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Standard (Specular setup)' - Pass 'FORWARD' has no vertex shader UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Standard (Specular setup)' - Pass 'FORWARD_DELTA' has no vertex shader UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Standard (Specular setup)' - Pass 'SHADOWCASTER' has no vertex shader UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Standard (Specular setup)' - Pass 'DEFERRED' has no vertex shader UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Standard (Specular setup)' - All passes removed UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Standard' - Pass 'FORWARD' has no vertex shader UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Standard' - Pass 'FORWARD_DELTA' has no vertex shader UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Standard' - Pass 'SHADOWCASTER' has no vertex shader UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Standard' - Pass 'DEFERRED' has no vertex shader UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Standard' - All passes removed UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Hidden/FXAA Preset 3' - Pass '' has no vertex shader UnityLoader.js:1:31246
WARNING: Shader Unsupported: 'Hidden/FXAA Preset 2' - Pass '' has no vertex shader UnityLoader.js:1:31246
UnloadTime: 0.750000 ms
The most obvious problems are with asset bundles.