1. @DomName('WebGL2RenderingContext.getShaderPrecisionFormat')
  2. @DocsEditable()
  3. @Experimental()
ShaderPrecisionFormat getShaderPrecisionFormat(int shadertype, int precisiontype)

Source 

@DomName('WebGL2RenderingContext.getShaderPrecisionFormat')
@DocsEditable()
@Experimental() // untriaged
ShaderPrecisionFormat getShaderPrecisionFormat(
        int shadertype, int precisiontype) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .getShaderPrecisionFormat_Callback_2_(
            this, shadertype, precisiontype);