PR for it here:
https://github.com/discourse/discourse/pull/4791
This feature is not supported on all browsers though. Here is the result from my testing on various OS:
Works on:
- Latest Safari on macOS
- Latest Chrome on macOS
- Latest Chromium on macOS
- IE11 on Windows 10
- Latest Chrome on Android 5
- Latest Safari on iOS 10
Does not work on:
- Latest Firefox on macOS
- Edge 14 on Windows 10