src/elements/Elt.js
function(attrs){
		var res='';
		UObj.forEach(attrs,function(k,v){
			res+=' '+k;
			if(v!==null) res+='="'+S.escape(v)+'"';
		});
		return res;
	}
function(attrs){
		var res='';
		UObj.forEach(attrs,function(k,v){
			res+=' '+k;
			if(v!==null) res+='="'+S.escape(v)+'"';
		});
		return res;
	}
/*#if NODE