**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`
expect(field[valueKey]).toBe(initialValue);
          
          field[valueKey] = changedValue;
          resetModules();
          
          const clientField = await renderIntoDom(
            element,
            field.parentNode,
            true,
          );
          
          
          
          expect(clientField === field).toBe(true);
          
          expect(clientField[valueKey]).toBe(changedValue);
        };
        it('should not blow away user-entered text on successful reconnect to an uncontrolled input', () =>
          testUserInteractionBeforeClientRender(
            <input defaultValue="Hello" />,
          ));
        it('should not blow away user-entered text on successful reconnect to a controlled input', async () => {
          let changeCount = 0;
          await testUserInteractionBeforeClientRender(
            <ControlledInput onChange={() => changeCount++} />,
          );
          
          
          
          expect(changeCount).toBe(0);