vendor/emmet.js
function(node) {
			if (node.children.length || node._text || this.isSnippet(node)) {
				return false;
			}
			
			var r = node.matchedResource();
			return r && r.is_empty;
		}
function(node) {
			if (node.children.length || node._text || this.isSnippet(node)) {
				return false;
			}
			
			var r = node.matchedResource();
			return r && r.is_empty;
		}
Test if passed node is unary (no closing tag)
@param {AbbreviationNode} node
@return {Boolean}