1. DomName('WebGLRenderingContext.sampleCoverage')
  2. DocsEditable()
void sampleCoverage(num value, bool invert)

Source 

@DomName('WebGLRenderingContext.sampleCoverage')
@DocsEditable()
void sampleCoverage(num value, bool invert) => _blink.BlinkWebGLRenderingContext.instance.sampleCoverage_Callback_2_(this, value, invert);