https://www.silvestar.codes/side-projects/invalid-css/
Invalid CSS ✣ S.Bistrović
Invalid CSS is a project that features CSS declarations that are not valid and non-existing. None of CSS code provided was valid at the time of publishing.
invalid css
https://developer.mozilla.org/es/docs/Web/CSS/Reference/Selectors/:user-invalid
:-moz-ui-invalid - CSS | MDN
La pseudo-clase CSS :-moz-ui-invalid representa cualquier elemento de los formularios que, en determinadas circunstancias, tiene restricciones de validación y...
invalid cssmozuimdn