The chrome inspector makes it easy to switch between device sizes/user agents. Rendering with a specific OS/browser combo is not something you can do accuratel

The chrome inspector makes it easy to switch between device sizes/user agents. Rendering with a specific OS/browser combo is not something you can do accurately without actually running that combo. There are services like Browserstack that will do this for you, but I don’t think it’s something that could realistically be built into a browser.