Clarify purpose of <script type="module">

alphagov · Dec 8, 2023 · e8b73f4 · e8b73f4
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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
@@ -160,6 +160,10 @@ You can also use your own function to generate paths, for example if you're usin
 
 ## JavaScript
 
+GOV.UK Frontend JavaScript must be run with `<script type="module">`.
+
+This protects older browsers, including all versions of Internet Explorer, from running modern JavaScript that it does not support. Read about our [browser support](../browser-support/) for more information.
+
 ### Before you start
 
 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](/use-nunjucks/).