[up-validate] again recognizes the [up-fieldset] attribute to find the form fragment
that should be replaced with validation results.
In the example below, changing the email input would only validate the first fieldset:
<form action="/users" id="registration">
  <div up-fieldset>
    Validation message
    <input type="text" name="email" up-validate />
  </div>
  <div up-fieldset>
    Validation message
    <input type="password" name="password" up-validate />
  </div>
</form>
    
      If you're upgrading from an older Unpoly version you should load unpoly-migrate.js
      to polyfill deprecated APIs.
    
    
      Changes handled by unpoly-migrate.js are not considered breaking changes.
    
  
See our upgrading guide for details.