Interface WEBGL_compressed_texture_etc
interface WEBGL_compressed_texture_etc {
COMPRESSED_R11_EAC: 37488;
COMPRESSED_RG11_EAC: 37490;
COMPRESSED_RGB8_ETC2: 37492;
COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2: 37494;
COMPRESSED_RGBA8_ETC2_EAC: 37496;
COMPRESSED_SIGNED_R11_EAC: 37489;
COMPRESSED_SIGNED_RG11_EAC: 37491;
COMPRESSED_SRGB8_ALPHA8_ETC2_EAC: 37497;
COMPRESSED_SRGB8_ETC2: 37493;
COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2: 37495;
}
COMPRESSED_R11_EAC: 37488;
COMPRESSED_RG11_EAC: 37490;
COMPRESSED_RGB8_ETC2: 37492;
COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2: 37494;
COMPRESSED_RGBA8_ETC2_EAC: 37496;
COMPRESSED_SIGNED_R11_EAC: 37489;
COMPRESSED_SIGNED_RG11_EAC: 37491;
COMPRESSED_SRGB8_ALPHA8_ETC2_EAC: 37497;
COMPRESSED_SRGB8_ETC2: 37493;
COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2: 37495;
}
 Properties
ReadonlyCOMPRESSED_R11_EAC  
COMPRESSED_R11_EAC: 37488
ReadonlyCOMPRESSED_RG11_EAC  
COMPRESSED_RG11_EAC: 37490
ReadonlyCOMPRESSED_RGB8_ETC2  
COMPRESSED_RGB8_ETC2: 37492
ReadonlyCOMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2    
COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2: 37494
ReadonlyCOMPRESSED_RGBA8_ETC2_EAC   
COMPRESSED_RGBA8_ETC2_EAC: 37496
ReadonlyCOMPRESSED_SIGNED_R11_EAC   
COMPRESSED_SIGNED_R11_EAC: 37489
ReadonlyCOMPRESSED_SIGNED_RG11_EAC   
COMPRESSED_SIGNED_RG11_EAC: 37491
ReadonlyCOMPRESSED_SRGB8_ALPHA8_ETC2_EAC    
COMPRESSED_SRGB8_ALPHA8_ETC2_EAC: 37497
ReadonlyCOMPRESSED_SRGB8_ETC2  
COMPRESSED_SRGB8_ETC2: 37493
ReadonlyCOMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2    
COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2: 37495
MDN Reference