API JSON messaging

I load devdocs in an iframe

## Example
2 function would look like this....

```js
window.parent.postMessage({message: { event:"css", type: "attribute",list:{} ,"*");
```

I post a JSON msg to you and you send BACK JSON to what i need or find and change what i need in the viewer.

```js
window.addEventListener('message', function(event) {
switch (event.data.message.event) {
case "CSS":
```