Ahmad Shadeed on CSS display: contents; — a feature that makes the DOM pretend that element just isn’t there (but it’s children are). Anything you use it for requires specific accessibility testing, but it can be quite useful. There are lots of use-cases here many of which boil down to “sometimes I want all these elements to be siblings, and sometimes I want wrappers around some of them”. I like Jeremy’s idea that HTML web component wrappers use this to remove themselves from equation, if the only purpose of that web component is augmenting the content already within it.
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Demystifying the View Transition Pseudo Tree
Each pseudo element plays a distinct role in how the view transition animates. The browser does most of the heavy lifting though, which makes it a little hard to see what’s actually happening under the hood.