1. DomName('WebGL2RenderingContext.sampleCoverage')
  2. DocsEditable()
  3. Experimental()
void sampleCoverage(num value, bool invert)

Source 

@DomName('WebGL2RenderingContext.sampleCoverage')
@DocsEditable()
@Experimental() // untriaged
void sampleCoverage(num value, bool invert) => _blink.BlinkWebGL2RenderingContext.instance.sampleCoverage_Callback_2_(this, value, invert);