BrowserStack
General
Link: https://www.browserstack.com
Local Testing
Local testing: https://www.browserstack.com/docs/live/local-testing
Possible problems
If you have a problem with auth (Error message is: "You cannot access this right now") - change your Location (button in setting panel "Change Location"). Use United State location. Change Location don't work with local testing.
Safari
For local testing in Safari use "npm run dev" in your project(widget), because Safari have problem with local testing. More info in this link: