open-consul/ui/packages/consul-ui/app/components/radio-card/index.hbs

<label
  ...attributes
  class="radio-card{{if checked ' checked'}}"
>
  <div>
    {{! workaround FF/Ember problem where you cannnot set a value to be value="" (empty)}}
    {{#if (gt value.length 0) }}
      <input type="radio" name={{name}} value={{value}} checked={{checked}} onchange={{action onchange}} />
    {{else}}
      <input type="radio" name={{name}} value="" checked={{checked}} onchange={{action onchange}} />
    {{/if}}
  </div>
  <div>
    {{yield}}
  </div>
</label>