1. DomName('WebGL2RenderingContext.vertexAttrib1f')
  2. DocsEditable()
  3. Experimental()
void vertexAttrib1f(int indx, num x)

Source 

@DomName('WebGL2RenderingContext.vertexAttrib1f')
@DocsEditable()
@Experimental() // untriaged
void vertexAttrib1f(int indx, num x) => _blink.BlinkWebGL2RenderingContext.instance.vertexAttrib1f_Callback_2_(this, indx, x);