feat: can pass content as flags

dom.js

@@ -5,6 +5,11 @@ function Node(parent, tag) {
 	this.text =  null;
 	// attributes are stored directly on the node object
 	// see https://github.com/elm/virtual-dom/blob/master/src/Elm/Kernel/VirtualDom.js#L511
+	// but Html.Attributes.attribute/2 uses Element.setAttribute
+	this.setAttribute = (key, val) => {
+		// as of now, there is no check if key conflict with the ones defined by Dom implementation
+		this[key] = val;
+	}
 	this.children =  [];  // List of Node
 	this.replaceChild =  (newNode, domNode) => {
 		this.children[domNode.pos-1] = newNode;
@@ -16,6 +21,9 @@ function Node(parent, tag) {
 	this.appendChild = (node) => {
 		node.pos = this.children.push(node);
 	}
+	this.replaceData = (offset, count, data) => {
+		this.text = data; // elm runtime will always replace the whole text
+	}
   this.dump = (d=0) => {
   	if (this.text != null) {
   		print(this.text);