1. @DomName('IntersectionObserver.unobserve')
  2. @DocsEditable()
  3. @Experimental()
void unobserve(Element target)

Source

@DomName('IntersectionObserver.unobserve')
@DocsEditable()
@Experimental() // untriaged
void unobserve(Element target) => _blink.BlinkIntersectionObserver.instance
    .unobserve_Callback_1_(this, target);