num globalAlpha

Source 

@DomName('CanvasRenderingContext2D.globalAlpha')
@DocsEditable()
num get globalAlpha =>
    _blink.BlinkCanvasRenderingContext2D.instance.globalAlpha_Getter_(this);
void globalAlpha=(num value)

Source 

@DomName('CanvasRenderingContext2D.globalAlpha')
@DocsEditable()
set globalAlpha(num value) => _blink.BlinkCanvasRenderingContext2D.instance
    .globalAlpha_Setter_(this, value);