I talked about this in a Short, but wasn't able to get the last half in because Shorts are too short, so here's the extended cut, where I look at how we can replicate the :user-valid using :not(:placeholder-shown) 🙂

🔗 Links 
✅ The codepen: https://codepen.io/kevinpowell/pen/bGPYZaN

⌚ Timestamps
00:00 - Introduction
00:38 - :user-valid and :user-invalid
01:28 - browser support
01:35 - alternative that has better browser support

#css

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Very small CSS tweaks for better forms

This is cool, thanks for sharing!

Útil, sencillo y fácil. Estas son las soluciones necesarias.

Nice! To fix that email issue I wonder why that JS RegEx from <a href="http://emailregex.com" target="_blank" rel="noopener nofollow">emailregex.com</a> isn’t working as the browser’s keep warning me that’s not a valid RegEx type.