This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.


The :-moz-ui-valid CSS pseudo-class represents any validated form element whose value validates correctly based on its validation constraints.

This pseudo-class is applied according to the following rules:

  • If the control does not have focus, and the value is valid, apply this pseudo-class.
  • If the control has focus, and the value was valid (including empty) when it gained focus, apply this pseudo-class.
  • If the control has focus, and the value was invalid when it gained focus, re-validate on every keystroke.
  • If the element is required, the preceding rules apply only if the user has changed the value or attempted to submit the form.

The result is that if the control was valid when the user started interacting with it, the validity styling is changed only when the user shifts focus to another control. However, if the user is trying to correct a previously-flagged value, the control shows immediately when the value becomes valid. Required items are flagged as invalid only if the user changes them or attempts to submit an unchanged invalid value.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support ? 4.0 (2) ? ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? ? ?

See also

Document Tags and Contributors

 Contributors to this page: fscholz, teoli, MusikAnimal, Sheppy, jswisher
 Last updated by: fscholz,