1. @DomName('SVGAnimationElement.hasExtension')
  2. @DocsEditable()
bool hasExtension(String extension)

Source 

@DomName('SVGAnimationElement.hasExtension')
@DocsEditable()
bool hasExtension(String extension) =>
    _blink.BlinkSVGAnimationElement.instance
        .hasExtension_Callback_1_(this, extension);