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| [](https://travis-ci.org/PolymerElements/iron-checked-element-behavior) |
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| _[Demo and API Docs](https://elements.polymer-project.org/elements/iron-checked-element-behavior)_ |
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| ##Polymer.IronCheckedElementBehavior |
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| 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. |
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