After some initial experiments with nesting in SCSS, I'm a little underwhelmed - but it's mostly due to how I structure things and where the emphasis lies. For me the most frequent issue is long chains of selectors with certain elements repeating - and for that :is() is my favorite thing lately. I still have scenarios to test it against, but overall pretty happy with it. Also, while I'm still waiting for full support for has() - with Firefox being the only red box at of today - :empty has been quite the surprise, allowing me to target only the containers that had no children or pseudo-elements on my latest pen. Without it I would've had a hard time. Oh, and speaking of great news from caniuse, the features I've been checking up on almost daily lately is trigonometric functions - sin(), cos() and the gang - and pow() and sqrt() in calcs. Safari has supported them for almost a year now, and Firefox picked up the trigonometric ones just last month. Waiting for Chrome, but as of today it looks like it's still a couple of releases down the line. Still, happy to see it taking root. Been waiting forever.