1. DomName('CSSStyleDeclaration.getPropertyPriority')
  2. DocsEditable()
String getPropertyPriority(String propertyName)

Source 

@DomName('CSSStyleDeclaration.getPropertyPriority')
@DocsEditable()
String getPropertyPriority(String propertyName) => _blink.BlinkCSSStyleDeclaration.instance.getPropertyPriority_Callback_1_(unwrap_jso(this), propertyName);