1. DomName('WebGL2RenderingContext.getVertexAttribOffset')
  2. DocsEditable()
  3. Experimental()
int getVertexAttribOffset(int index, int pname)

Source 

@DomName('WebGL2RenderingContext.getVertexAttribOffset')
@DocsEditable()
@Experimental() // untriaged
int getVertexAttribOffset(int index, int pname) => _blink.BlinkWebGL2RenderingContext.instance.getVertexAttribOffset_Callback_2_(this, index, pname);