**Do you want to request a *feature* or report a *bug*?**

Feature

**What is the current behavior?**

While server rendering React DOM and then hydrating with a different structure, React rightly warns that there are inconsistencies. But when I first saw these warnings I was not sure exactly what was going wrong.

Here are a few of the warnings I have been receiving:

```
Warning: Did not find a matching <button> in <div>.

Warning: Did not find a matching <img> in <div>.

Warning: Did not expect server HTML to contain a <div> in <div>.
```

Only on that last error did I catch on that this was a problem with server-rendering and the inconsistencies between that and my client render (intentional at the moment while testing some things in unpure render functions).

**What is the expected behavior?**

Being more explicit that this was a rendering inconsistency between server and client.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

React v16-beta.1
if (!styleUpdates) {
            if (!updatePayload) {
              updatePayload = [];
            }
            updatePayload.push(propKey, styleUpdates);
          }
          styleUpdates = nextProp;
        }
      } else if (propKey === DANGEROUSLY_SET_INNER_HTML) {
        var nextHtml = nextProp ? nextProp[HTML] : undefined;
        var lastHtml = lastProp ? lastProp[HTML] : undefined;
        if (nextHtml != null) {
          if (lastHtml !== nextHtml) {
            (updatePayload = updatePayload || []).push(propKey, '' + nextHtml);
          }
        } else {
          
          
        }
      } else if (propKey === CHILDREN) {
        if (
          lastProp !== nextProp &&
          (typeof nextProp === 'string' || typeof nextProp === 'number')
        ) {
          (updatePayload = updatePayload || []).push(propKey, '' + nextProp);
        }
      } else if (propKey === SUPPRESS_CONTENT_EDITABLE_WARNING) {
        
      } else if (registrationNameModules.hasOwnProperty(propKey)) {