Responsively - Test your app on multiple devices

Just discovered this today while browsing Twitter, might be useful to some of you here, and it’s free. It’s like what we have in the Editor but with the ability to test on many devices and possibly with a tweak in the user agent settings we can test more browsers, I assume.

It allows you to test how a link displays on different types of devices at once.

Also, inspect element for the HTML/CSS guys.