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

**What is the current behavior?**
I've started recieving this warning about my SVGs which is using [feGaussianBlur](https://developer.mozilla.org/en-US/docs/Web/SVG/Element/feGaussianBlur): 
`Warning: Expected server HTML to contain a matching <feGaussianBlur> in <filter>.`

**What is the expected behavior?**
Should be no warnings because there are no difference.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
Such behavior started right after updating to `React 16.0.0-rc.3` and never happened with `React 15.6.1`
},
  commitMount(
    domElement: Instance,
    type: string,
    newProps: Props,
    internalInstanceHandle: Object,
  ): void {
    ((domElement: any):
      | HTMLButtonElement
      | HTMLInputElement
      | HTMLSelectElement
      | HTMLTextAreaElement).focus();
  },
  commitUpdate(
    domElement: Instance,
    updatePayload: Array<mixed>,
    type: string,
    oldProps: Props,
    newProps: Props,
    internalInstanceHandle: Object,
  ): void {
    
    
    updateFiberProps(domElement, newProps);
    
    updateProperties(domElement, updatePayload, type, oldProps, newProps);
  },
  shouldSetTextContent(type: string, props: Props): boolean {
    return (
      type === 'textarea' ||