There's so much to say about Apple's new software design, which they call Liquid Glass and I call Liquid Crass. I've already said a bit about it, but as the saying goes, a picture is worth a thousand words.
Above is the popup window of my Safari extension ChangeTheHeaders on macOS 26. Notice that the scroll bar is clipped at the top! This is why corner radius matters. It's not just an aesthetic choice. Design is how it works, and Liquid Glass does not work right.
Below is the same popup window on macOS 15. (Disclaimer: the screenshots were taken on different Macs, the above with a non-retina display, the below with a retina display.)
The corner radius, while not zero, is less exaggerated, and thus the top of the scroll bar is not clipped.
I've also noticed a crazy new animation with HTML <select> elements on iOS 26. (My Safari extension popup window is HTML, by the way.) First, here's a screen recording of the old animation on my iPhone running iOS 18.
I'm not sure why the popup isn't attached to the button, but at least it appears to come out of the button. Now let's look at the same page on my iPad running iOS 26.
What… in the world was that? The popup is attached to the button this time, which is an improvement, but the popup appears to come not from the button but from the top of the iPad!
I suppose that the defense will be, "It's just a beta!" But the purpose of a beta is to solicit feedback, so this is my feedback.
Other people, some of whom are professional designers, have written extensively and eloquently on the downsides of Liquid Crass, more extensively and eloquently than I'm capable of as a mere code monkey. I'm not going to write a dissertation on the subject; I never even finished my PhD dissertation. I just wanted to point out some Safari-adjacent issues, an area in which I specialize. To be honest, I also wanted to coin and promulgate the term Liquid Crass.