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[](https://travis-ci.org/PolymerElements/iron-checked-element-behavior)
_[Demo and API Docs](https://elements.polymer-project.org/elements/iron-checked-element-behavior)_
##Polymer.IronCheckedElementBehavior
Use `Polymer.IronCheckedElementBehavior` to implement a custom element
that has a `checked` property, which can be used for validation if the
element is also `required`. Element instances implementing this behavior
will also be registered for use in an `iron-form` element.