Here's the above code piece in action:
HTML <noscript> tag has an alternative content, which is displayed in the browsers, that don’t support scripts, or the browsers, where the script support is disabled by the user. In other cases, the browser ignores this tag and its content.
<noscript> <META HTTP-EQUIV="Refresh" CONTENT="0;URL=ShowErrorPage.html"> </noscript>
The meta refresh method consists of HTML <meta> tag with the http-equiv parameter set to "refresh" and a content parameter giving the time interval in seconds, so this will redirect the user to another page in the interval specified in that header. By setting the refresh time interval to zero (or little value), meta refresh can be used as a method of URL redirection.