iron-form demo

### Iron-form works with native and custom elements, and can prevent automatic redirection

### You can submit a form in many different ways: by manually calling submit(), using a native button, or by wrapping a paper-button in a native button:

### To customize the request sent to the server, you can listen to the `iron-form-presubmit` event

### Example of an `iron-form` reacting to state changes.

This form will have the "Submit" button disabled until all fields are valid, and then show a spinner during submission.

### Iron-form respects the novalidate form attribute

### Iron-form respects nested elements