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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_compressed_texture_etc below:

WEBGL_compressed_texture_etc extension - Web APIs

The compressed texture formats are exposed by 10 constants and can be used in two functions: compressedTexImage2D() and compressedTexSubImage2D().

ext.COMPRESSED_R11_EAC: One-channel (red) unsigned format compression.
ext.COMPRESSED_SIGNED_R11_EAC: One-channel (red) signed format compression.
ext.COMPRESSED_RG11_EAC: Two-channel (red and green) unsigned format compression.
ext.COMPRESSED_SIGNED_RG11_EAC: Two-channel (red and green) signed format compression.
ext.COMPRESSED_RGB8_ETC2: Compresses RGB8 data with no alpha channel.
ext.COMPRESSED_RGBA8_ETC2_EAC: Compresses RGBA8 data. The RGB part is encoded the same as RGB_ETC2, but the alpha part is encoded separately.
ext.COMPRESSED_SRGB8_ETC2: Compresses sRGB8 data with no alpha channel.
ext.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC: Compresses sRGBA8 data. The sRGB part is encoded the same as SRGB_ETC2, but the alpha part is encoded separately.
ext.COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2: Similar to RGB8_ETC, but with ability to punch through the alpha channel, which means to make it completely opaque or transparent.
ext.COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2: Similar to SRGB8_ETC, but with ability to punch through the alpha channel, which means to make it completely opaque or transparent.

Examples

const ext = gl.getExtension("WEBGL_compressed_texture_etc");

const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);

gl.compressedTexImage2D(
  gl.TEXTURE_2D,
  0,
  ext.COMPRESSED_RGBA8_ETC2_EAC,
  512,
  512,
  0,
  textureData,
);

Specifications Browser compatibility

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Compatibility notes

This extension was named WEBGL_compressed_texture_es3 from Firefox 46 to Firefox 51 and used to be available on the WebGL 2 context by default â this is not the case anymore. You have to enable it on both, WebGL 1 and WebGL 2 contexts, in order to use it.