Example
Use of the <noscript> tag:<script>
document.write("Hello World!")
</script>
<noscript>Your browser does not support JavaScript!</noscript>
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The <noscript> tag is supported in all major browsers.
Definition and Usage
The <noscript> tag is used to provide an alternate content for users that have disabled scripts in their browser or have a browser that doesn’t support client-side scripting.The <noscript> element can contain all the elements that you can find inside the <body> element of a normal HTML page.
The content inside the <noscript> element will only be displayed if scripts are not supported, or are disabled in the user’s browser.
Tips and Notes
Tip: It is also a good practice to use the comment tag to "hide" scripts from browsers without support for client-side scripts (so they don't show them as plain text):<script>
<!--
function displayMsg()
{
alert("Hello World!")
}
//-->
</script>