title: Sending a form response to an iFrame in React
body: <p>I'm trying to send an embedded Mailchimp signup form's response to a hidden iFrame, to prevent the form opening the link contained in the form's <code>action</code>. I'm working in React, and the standard approach doesn't seem to be working. I have: </p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;div class="embedSignup"&gt;
   &lt;form action="https://app.usXX.list-manage.com/subscribe/post" method="post" formTarget="hiddenFrame"&gt;
    // ... form elements
   &lt;/form&gt;
  &lt;/div&gt;
  &lt;iframe name="hiddenFrame" src="about:blank" style={{display:"none"}}&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>But it continues to default to <code>target="_self"</code> behavior. </p>
  
  <p>I've tried using <code>target</code>, <code>formtarget</code>, and <code>formTarget</code>, and none worked. </p>
  
  <p>Any help is much appreciated. </p>