diff --git a/src/layout.js b/src/layout.js
index d2619cf..5ad571c 100644
--- a/src/layout.js
+++ b/src/layout.js
@@ -3,6 +3,15 @@ import ReactDOM from 'react-dom';
 
 import nodeTypes from 'rendering/types';
 
+const normalizeBBox = box => ({
+  width: 0,
+  height: 0,
+  axisY: (box.height || 0) / 2,
+  axisX1: 0,
+  axisX2: (box.width || 0),
+  ...box
+});
+
 const layout = data => {
   if (typeof data == 'string') {
     return data;
@@ -14,10 +23,15 @@ const layout = data => {
     data.children = data.children.map(layout);
   }
 
-  return nodeTypes[type].layout({
+  const result = nodeTypes[type].layout({
     props: {},
     ...data
   });
+
+  return {
+    ...result,
+    box: normalizeBBox(result.box)
+  };
 };
 
 const getBBox = content => {