As of April 14, 2026, this name is no longer defined by a Web Platform specification
Definition
WebGL WEBGL_compressed_texture_etc1 Extension Specification defines WEBGL_compressed_texture_etc1
[Exposed=(Window,Worker), LegacyNoInterfaceObject]
interface WEBGL_compressed_texture_etc1 {
/* Compressed Texture Format */
const GLenum COMPRESSED_RGB_ETC1_WEBGL = 0x8D64;
};