Form validity pseudo-classes
Widely available since 2018-01-29
The form validity CSS pseudo-classes match <form> elements based on the constraints of a form field, such as validity (:valid, :invalid, :in-range, :out-of-range) and necessity (:optional or :required).
Specifications
Browser support (view on caniuse.com)
- Chrome 10 Released on 2011-03-08
- Chrome Android 18 Released on 2012-06-27
- Edge 12 Released on 2015-07-29
- Firefox 4 Released on 2011-03-22
- Firefox for Android 4 Released on 2011-03-29
- Safari 5 Released on 2010-06-07
- Safari on iOS 5 Released on 2011-10-12
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