liebling/partials/subscribe_form.hbs

<form method="post" action="{{action}}" id="{{form_id}}" class="{{form_class}}">
  {{hidden}}

  <fieldset>
    <label for="{{input_id}}" class="sr-only">{{placeholder}}</label>
    {{input_email id=input_id class=input_class placeholder=placeholder value=email autofocus=autofocus}}
  </fieldset>
  <button id="{{button_id}}" class="{{button_class}}" type="submit">Subscribe</button>

  {{script}}

  {{#if error}}
    <p class="m-small-text in-subscribe-page">Email cannot be blank.</p>
  {{/if}}
</form>