diff --git a/domkit/CssParser.hx b/domkit/CssParser.hx
index 1413405..4235d15 100644
--- a/domkit/CssParser.hx
+++ b/domkit/CssParser.hx
@@ -313,9 +313,10 @@ class CssParser {
 	}
 
 	function readValueUnit( f : Float, ?i : Int ) {
+		var curPos = pos;
 		var t = readToken();
 		return switch( t ) {
-		case TIdent(u):
+		case TIdent(u) if( pos == curPos + u.length ):
 			if( u == "px" )
 				(i == null ? VFloat(f) : VInt(i)); // ignore "px" unit suffit
 			else
diff --git a/domkit/Document.hx b/domkit/Document.hx
index bb513eb..588164b 100644
--- a/domkit/Document.hx
+++ b/domkit/Document.hx
@@ -27,4 +27,13 @@ class Document<T> {
 		root.remove();
 	}
 
+	public function add<T2:{public var document:Document<T>;} & T>( v : T2 ) {
+		var elt = v.document.root;
+		if( elt.parent != null ) throw "Already added";
+		var parent = Element.getParent(v);
+		var parentElt = get(parent);
+		parentElt.children.push(v.document.root);
+		elt.parent = parentElt;
+	}
+
 }
\ No newline at end of file
diff --git a/domkit/Element.hx b/domkit/Element.hx
index 1f5e211..f153235 100644
--- a/domkit/Element.hx
+++ b/domkit/Element.hx
@@ -149,6 +149,10 @@ class Element<T> {
 		return Ok;
 	}
 
+	public static dynamic function getParent<T>( e : T ) : T {
+		return null;
+	}
+
 	public static dynamic function addElement( e : Element<Dynamic>, to : Element<Dynamic> ) {
 	}