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

**What is the current behavior?**
In Firefox the `dialog` element is not implemented. We use a polyfill to be able to support it. Everything works well. But React warns that the `dialog` element is unrecognized, and this on each page load, which is quite useless (for this specific case).
I would like the possibility to disable the  warning but only for some elements. So the utility of this warning remains when the developer mistype the component name.

**What is the expected behavior?**
Once we specified which tag are "accepted/normal" React will not warn on specified unrecognized tags.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
React 16
Firefox 57

In previous versions there was no warning.

Is this clear enough? Do you need any other information?
Cheers
if (nextProp != null) {
          
          if (__DEV__ && typeof nextProp !== 'function') {
            warnForInvalidEventListener(propKey, nextProp);
          }
          ensureListeningTo(rootContainerElement, propKey);
        }
        if (!updatePayload && lastProp !== nextProp) {
          
          
          
          updatePayload = [];
        }
      } else {
        
        
        (updatePayload = updatePayload || []).push(propKey, nextProp);
      }
    }
    if (styleUpdates) {
      (updatePayload = updatePayload || []).push(STYLE, styleUpdates);
    }
    return updatePayload;
  },
  
  updateProperties(
    domElement: Element,
    updatePayload: Array<any>,
    tag: string,
    lastRawProps: Object,