**[ This description is mirrored from README.md at [github.com/LostInBrittany/granite-validator-mixin](https://github.com//LostInBrittany/granite-validator-mixin/blob/1.0.2/README.md) on 2019-05-22 ]** [](https://www.webcomponents.org/element/LostInBrittany/granite-validator-mixin) # GraniteElements.ValidatorMixin A mixin to implement a custom input or form validator ## Doc & demo [https://lostinbrittany.github.io/granite-validator-mixin](https://lostinbrittany.github.io/granite-validator-mixin) ## GraniteElements.ValidatorMixin Use GraniteElements.ValidatorMixin to implement a custom input/form validator. Element instances implementing this behavior will be registered for use in elements that implement `Polymer.IronValidatableBehavior`.