Another tiny thing coming to the web: :user-invalid.💪
It used to be a FF-only thing but made it into Webkit in Dec.
You can style and show the validation state of form elements only after someone interacted with them with :user-invalid/:user-valid. 🥰
Here's the chrome bug if you wanna star it: https://bugs.chromium.org/p/chromium/issues/detail?id=1156069
:invalid がいまいち使いにくいのを解決してくれる擬似クラスか〜 https://front-end.social/@stefan/109800516918502323 [参照]