1. DomName('WebGL2RenderingContext.compressedTexSubImage2D')
  2. DocsEditable()
  3. Experimental()
void compressedTexSubImage2D(int target, int level, int xoffset, int yoffset, int width, int height, int format, TypedData data)

Source 

@DomName('WebGL2RenderingContext.compressedTexSubImage2D')
@DocsEditable()
@Experimental() // untriaged
void compressedTexSubImage2D(int target, int level, int xoffset, int yoffset, int width, int height, int format, TypedData data) => _blink.BlinkWebGL2RenderingContext.instance.compressedTexSubImage2D_Callback_8_(this, target, level, xoffset, yoffset, width, height, format, data);