hey folks, looks like [this code](https://github.com/facebook/react/commit/b565f495319750d98628425d120312997bee410b) added small issue with safari and it could flood devtools console output with messages like this:
<img width="875" alt="screenshot 2018-10-26 at 15 25 33" src="https://user-images.githubusercontent.com/778908/47569863-0e3a5c80-d935-11e8-8e59-8d95d35ba131.png"> 
As I understand it happens [here](https://github.com/facebook/react/commit/b565f495319750d98628425d120312997bee410b#diff-a654f37b01573fc8006b426d56ad53ceR50) and I see you catch the error, but safari still adds the error message if you have iframes with different origin
let {start, end} = offsets;
  if (end === undefined) {
    end = start;
  }
  if ('selectionStart' in input) {
    input.selectionStart = start;
    input.selectionEnd = Math.min(end, input.value.length);
  } else {
    setOffsets(input, offsets);
  }
}