On my iPhone 13 Pro running iOS 16.3.1, iOS Safari incorrectly reports supporting OES_texture_float_linear see https://webgplreport.com notice: OES_texture_float_linear shows up as a supported extension Then, go to: https://jsgist.org/?src=94615d573985d60b76314bd4857f6410 First try desktop: See the texture is filtered (the texture is an RGBA32 texture) Now go the same url on iPhone, See the texture is not filtered Note: The conformance test for oes_texture_float_linear passes on iOS but looking into the source it never actually checks if results are actually filtered. https://registry.khronos.org/webgl/sdk/tests/conformance/extensions/oes-texture-float-linear.html?webglVersion=2&quiet=0&quick=1