Signpost important infos for using our JavaScript components

More content to be added in #341
alphagov · Oct 26, 2023 · 872c929 · 872c929
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diff --git a/source/importing-css-assets-and-javascript/index.html.md.erb b/source/importing-css-assets-and-javascript/index.html.md.erb
@@ -137,6 +137,12 @@ You can also use your own function to generate paths, for example if you're usin
 
 ## JavaScript
 
+Before you import JavaScript from GOV.UK Frontend, you'll need to add the following to the top of the `<body class="govuk-template__body">` section of your page template (if you're not [using our Nunjucks macros](https://frontend.design-system.service.gov.uk/use-nunjucks/)):
+
+```html
+<script>document.body.className += ' js-enabled' + ('noModule' in HTMLScriptElement.prototype ? ' govuk-frontend-supported' : '');</script>
+```
+
 To import the JavaScript from GOV.UK Frontend, you can either:
 
 - add GOV.UK Frontend's JavaScript file to your HTML