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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_compressed_texture_etc1 below:

WEBGL_compressed_texture_etc1 extension - Web APIs

The compressed texture format is exposed by a constant and can be used with the compressedTexImage2D() method (note that ETC1 is not supported with the compressedTexSubImage2D() method).

ext.COMPRESSED_RGB_ETC1_WEBGL: Compresses 24-bit RGB data with no alpha channel.

Examples

const ext = gl.getExtension("WEBGL_compressed_texture_etc1");

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

gl.compressedTexImage2D(
  gl.TEXTURE_2D,
  0,
  ext.COMPRESSED_RGB_ETC1_WEBGL,
  512,
  512,
  0,
  textureData,
);

Specifications Browser compatibility

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