1. @DomName('Document.getElementsByTagName')
  2. @DocsEditable()
List<Node> getElementsByTagName(String localName)

Source 

@DomName('Document.getElementsByTagName')
@DocsEditable()
List<Node> getElementsByTagName(String localName) =>
    (_blink.BlinkDocument.instance
        .getElementsByTagName_Callback_1_(this, localName));