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_[Demo and API docs](https://elements.polymer-project.org/elements/iron-validatable-behavior)_


## Polymer.IronValidatableBehavior

`Use Polymer.IronValidatableBehavior` to implement an element that validates user input.
Use the related `Polymer.IronValidatorBehavior` to add custom validation logic to an iron-input.

By default, an `<iron-form>` element validates its fields when the user presses the submit button.
To validate a form imperatively, call the form's `validate()` method, which in turn will
call `validate()` on all its children. By using `Polymer.IronValidatableBehavior`, your
custom element will get a public `validate()`, which
will return the validity of the element, and a corresponding `invalid` attribute,
which can be used for styling.

To implement the custom validation logic of your element, you must override
the protected `_getValidity()` method of this behaviour, rather than `validate()`.
See [this](https://github.com/PolymerElements/iron-form/blob/master/demo/simple-element.html)
for an example.

### Changes in 2.0
- `validate()` no longer requires a `value` paramer to be passed, and will use the element's `value` property if it exists
- `validatorType` and `validatorName` were unused and have been removed

### Accessibility

Changing the `invalid` property, either manually or by calling `validate()` will update the
`aria-invalid` attribute.


