🫧 Open on Bubbles Three years ago, I came up with a solution to add borders to a Flexbox layout by using the ::before and ::after pseudo elements. I had been inspired by Ahmad Shadeed’s Flexbox Dynamic Line Separator article. I wrote about my solution, CSS Trick: Flexbox Borders . It remains one of my more popular articles on search. Fast forward to 2026. There is a new CSS feature that is not yet Baseline available that will make my solution obsolete. The feature is called gap decorations. So I wanted to r