1. DomName('CSSKeyframesRule.deleteRule')
  2. DocsEditable()
  3. Experimental()
void deleteRule(String key)

Source 

@DomName('CSSKeyframesRule.deleteRule')
@DocsEditable()
@Experimental() // untriaged
void deleteRule(String key) => _blink.BlinkCSSKeyframesRule.instance.deleteRule_Callback_1_(unwrap_jso(this), key);