1. @DomName('CSSStyleDeclaration.getPropertyPriority')
  2. @DocsEditable()
String getPropertyPriority(String property)

Source 

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