The WEBGL_compressed_texture_s3tc_srgb extension is part of the WebGL API and exposes four S3TC compressed texture formats for the sRGB colorspace.
WEBGL_compressed_texture_s3tc_srgb
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WEBGL_compressed_texture_s3tc_srgbextension is part of the WebGL API and exposes four S3TC compressed texture formats for the sRGB colorspace.MDN Reference