One level children

src/Layout.js

@@ -1,10 +1,28 @@
 
 function computeLayout(node) {
-  return {
+  var top = 0;
+  var children = [];
+  (node.children || []).forEach(function(child) {
+    console.log(child);
+    children.push({
+      top: top,
+      left: 0,
+      width: child.style.width,
+      height: child.style.height
+    });
+    top += child.style.height;
+  });
+
+  var result = {
     top: 0,
     left: 0,
     width: node.style.width,
     height: node.style.height
   };
+
+  if (children.length > 0) {
+    result.children = children;
+  }
+  return result;
 }