WEBGL_compressed_texture_s3tc WebGL extensionThe WEBGL_compressed_texture_s3tc extension for WebGL 1.0 and 2.0 contexts adds S3TC compressed texture formats to compressedTexImage2D() and compressedTexSubImage2D().webgl-extensionsWebGL extensionslimitedhttps://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_s3tc/https://developer.mozilla.org/docs/Web/API/WEBGL_compressed_texture_s3tcapi.WEBGL_compressed_texture_s3tchttps://nowyoucanuse.com/features--webgl-compressed-texture-s3tc.html