A few neat little Safari developer tools
First off, there’s the keyboard shortcut to activate responsive mode:
R. I love the way devices are presented along the top of the screen.
Secondly, I noticed that Safari’s responsive mode can replicate other browsers and browser versions. I doubt that’s new, but my blonde brain finally noticed it.
Lastly, I saw Manuel’s little Safari-related pro-tip that there’s a tiny setting that forces the scroll bar to always be visible. What a great way to debug spacing issues during development without having to first interact with the page!