title: is form enctype "application/json" available?
body: <p>I was reading this <a href="https://www.w3.org/TR/html-json-forms/" rel="noreferrer">w3c document</a> about post JSON data with html form, and trying to test it.</p>
  
  <p>my test form is as follows:</p>
  
  <pre><code> &lt;form action="postjson.php" method="POST" enctype="application/json"&gt;
      &lt;input type="hidden" name="touser" value="shenkwen" /&gt;
      &lt;input type="hidden" name="msgtype" value="text" /&gt;
      &lt;input type="hidden" name="agentid" value="23" /&gt;
      &lt;input type="hidden" name="text[content]" value="test message" /&gt;
      &lt;input type='submit' value="submit" /&gt;
    &lt;/form&gt;
  </code></pre>
  
  <p>and content for <code>postjson.php</code></p>
  
  <pre><code>&lt;?php var_dump($_POST); 
  </code></pre>
  
  <p>I was expecting the value of $_POST being a JSON string, however, it is just a normal PHP object:</p>
  
  <pre><code>array(4) { ["touser"]=&gt; string(8) "shenkwen" ["msgtype"]=&gt; string(4) "text" ["agentid"]=&gt; string(2) "23" ["text"]=&gt; array(1) { ["content"]=&gt; string(33) "test message" } }
  </code></pre>
  
  <p>I tried removing the <code>enctype</code> attribute and the output is exactly the same. Then I went back to the document page and noticed that it says something indicating this standard may not be in effect.</p>
  
  <p>So this is also a question about how to use W3C website, it seems to me some pages on it are just drafts. So is this page a draft? When I read pages on w3c how do I tell whether it is a draft or it is a working standard? And finally and most importantly, is <code>enctype='application/json'</code> working or not?</p>