1. DomName('WebGLRenderingContext.vertexAttrib1f')
  2. DocsEditable()
void vertexAttrib1f(int indx, num x)

Source 

@DomName('WebGLRenderingContext.vertexAttrib1f')
@DocsEditable()
void vertexAttrib1f(int indx, num x) => _blink.BlinkWebGLRenderingContext.instance.vertexAttrib1f_Callback_2_(this, indx, x);