title: How to disable mobile zooming in wordpress admin?
body: <p>So I've removed the viewport from <code>/wp-admin/admin-header.php</code> and installed my own viewport via <code>admin_head</code> action:</p>
  
  <pre><code>add_action('admin_head','CustomHead',1,1);
  </code></pre>
  
  <p>That's my viewport</p>
  
  <pre><code>&lt;meta name="viewport" content="initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,width=device-width, user-scalable=no" /&gt;
  </code></pre>
  
  <p>Works fine so far. I did the same with <code>wp_head</code> to test it and it works as expected on the frontend. But it's just getting ignored on the backend. </p>
  
  <p>I'm not very experienced with viewports. Are there any other techniques (dis)allowing to zoom on mobile devices? </p>
  
  <p>Well I know it's not recommend to disable the zooming function. Anyway, I want to know why it's not working ;)</p>