    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fr">
    <head>
        <title>XHTML</title>
    </head>
    <body>

    <p>Bla bla bla</p>

    <style>
    <!-- xml comment -->
    parentRule {
      /* oups, xml error, but nesteed rule :/ */
      & childRule {
      }
    }

    /* <![CDATA[ */
    <!-- oups -->
    parentRule {
      & childRule {
      }
    }
    /* ]]> */

    <![CDATA[
    <!-- oups -->
    parentRule {
      & childRule {
      }
    }
    ]]>
    </style>

    <script>
    <!-- xml comment -->
    console.log(a & b);
    /* <![CDATA[ */
    <!-- oups -->
    console.log(a & b);
    /* ]]> */

    <![CDATA[
    <!-- oups -->
    console.log(a & b);
    ]]>
    </script>

    </body>
    </html>