title: how to write comment in correct way
body: <p>How to write comments in an (x)HTML file? just using <code>&lt;!-- comment --&gt;</code>?
  Is it correct also?: <code>&lt;!-"-" comment "-"-&gt;</code>?
  Any other methods to put a comment in code? (because some editors filter <code>&lt;!-- --&gt;</code> comments).</p>