amp-recaptcha-input

<script async custom-element="amp-recaptcha-input" src="https://cdn.ampproject.org/v0/amp-recaptcha-input-0.1.js"></script>

<form id="amp-recaptcha-input-form" method="POST" action-xhr="https://amp.dev.org.tw/documentation/examples/components/amp-recaptcha-input/api/recaptcha" target="_top">
  <fieldset>
    <label>
      <span>Search for</span>
      <input type="search" name="term" required>
    </label>
    <input name="submit-button" type="submit" value="Search">
    <amp-recaptcha-input layout="nodisplay" name="recaptcha_token" data-sitekey="6LfcQ7IUAAAAAIv1KcgqyExGK0v8dLJtvV_Q6xD-" data-action="recaptcha_example">
    </amp-recaptcha-input>
  </fieldset>

  <div class="loading-message">Loading...</div>

  <div submit-success>
    <template type="amp-mustache">
      <h1>You searched for: {{term}}</h1>
      <div><b>Score:</b> {{score}}</div>
      <div><b>Recaptcha token:</b> {{recaptcha_token}}</div>
      <div><b>Action:</b> {{action}}</div>
    </template>
  </div>

  <div submit-error>
    <template type="amp-mustache">
      <h1>Error! Please check the JS Console in your dev tools.</h1>
      <p>{{message}}</p>
    </template>
  </div>
</form>