title: html comment in head title tag - is it syntactically correct and ignored by search engines?
body: <p>I have a web page which delivers templates to applications on external servers, so they can run in the same page environment.</p>
  
  <p>Now I'd like to put html comments as placeholders in the head title tag like this:</p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
  &lt;title&gt;&lt;!--placeholder--&gt;Main Site Name&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;&lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Is that syntactically correct and would search engines ignore the comment?</p>