(I am using 15rc2 because I need all the svg tags)

I am rendering a foreignObject svg tag. According to [MDN](https://developer.mozilla.org/en-US/docs/Web/SVG/Element/foreignObject) I put body tag inside that tag and then whatever html I want in there.

``` html
<foreignObject>
  <body xmlns="http://www.w3.org/1999/xhtml">
   <!-- whatever html I want -->
  </body>
</foreignObject>
```

renderToString on the server leaves the body tag in place, and gives it a react-dataid. However when rendered on the client that body tag is removed. So when I look at the live elements, the body inside foreignObjects is gone, along with it's data-reactid.  The server source ( ie view page source ) shows that the body tag was rendered with the missing react-dataid.

The result is that you get a “Invariant Violation: Unable to find element with ID XX”, when the page updates, and somethings don't work.

Removing the body from inside the foreignObject tag seems to solve the problem, 

``` html
<foreignObject>
   <!-- whatever html I want -->
</foreignObject>
```

but I don't know if that is an "OK" solution to this or if that body tag is necessary in some scenarios.  But in either case this seems to be a scenario where server rendering results in different DOM/HTML then client rendering.

Is this a problem, or is the body tag not supposed to there anyway?

Todd

[],
        ancestorOwnerNames,
        ancestorTag,
        
        invalidAncestor ? ['...'] : [],
        childOwnerNames,
        childTag
      ).join(' > ');
      var warnKey =
        !!invalidParent + '|' + childTag + '|' + ancestorTag + '|' + ownerInfo;
      if (didWarn[warnKey]) {
        return;
      }
      didWarn[warnKey] = true;
      var tagDisplayName = childTag;
      if (childTag !== '#text') {
        tagDisplayName = '<' + childTag + '>';
      }
      if (invalidParent) {
        var info = '';
        if (ancestorTag === 'table' && childTag === 'tr') {
          info +=
            ' Add a <tbody> to your code to match the DOM tree generated by ' +
            'the browser.';
        }
        warning(
          false,
          'validateDOMNesting(...): %s cannot appear as a child of <%s>. ' +
          'See %s.%s',
          tagDisplayName,