I’m not the world’s biggest fan of LQIP’s (low quality image placeholders) generally (doing nothing other than handling aspect ratio is… fine), but I really like how much creativity it inspires. I’ve seen a ton of different approaches to it over the years, that all use different technology and all have different advantages and disadvantages. Lean Rada has another interesting take with Minimal CSS-only blurry image placeholders where a single custom property is the seed for massively different CSS backgrounds generated from overlapping radial gradients with oklab colors.
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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.