I was looking for an alternative to my current method which is

    $cgi->start_html(
      ...
      -script => {-language => 'javascript', -src => '../javascript/sc
+ript.js'},
      -onLoad => 'init()',
    ),
[download]

where script.js contains

function init() {
  document.getElementById('jsDisabled').style.display = 'none';
}
[download]

which hides a message about javascript being disabled, but sometimes it briefly appears on the page, so I wondered if using the noscript tag would improve on that.