Form validity pseudo-classesBaseline · Widely available
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).
Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Jul 29, 2015. Widely available since Jan 29, 2018.
Browser support
DesktopChrome
1–9Not supported
10+Supportedsince Mar 8, 2011
Current: 155Edge
12+Supportedsince Jul 29, 2015
Current: 154Firefox
1–3.6Not supported
4+Supportedsince Mar 22, 2011
Current: 157Safari
1–4Not supported
5+Supportedsince Jun 7, 2010
Current: 27MobileChrome Android
18+Supportedsince Jun 27, 2012
Current: 155Firefox Android
4+Supportedsince Mar 29, 2011
Current: 157Safari iOS
1–4.2Not supported
5+Supportedsince Oct 12, 2011
Current: 27How to use
This feature is Baseline widely available — use it freely, no fallback needed.
Example
Full syntax and examples are on MDN: :in-range.
Feature detection
CSS · check before using
@supports selector(:invalid) {
/* styles that use :invalid */
}
/* or in JavaScript */
if (CSS.supports("selector(:invalid)")) {
// use it
}Documentation (MDN)
Specification
Sub-features
Support for each part of the feature (8). The overall table above shows when the whole feature works.