From e8b73f4e7f3f4befd3ff96e65bf52be425c04e04 Mon Sep 17 00:00:00 2001
From: Colin Rotherham <work@colinr.com>
Date: Thu, 7 Dec 2023 21:41:53 +0000
Subject: [PATCH] Clarify purpose of `<script type="module">`

---
 source/importing-css-assets-and-javascript/index.html.md.erb | 4 ++++
 1 file changed, 4 insertions(+)
diff --git a/source/importing-css-assets-and-javascript/index.html.md.erb b/source/importing-css-assets-and-javascript/index.html.md.erb
index bc721566..add31fec 100644
--- 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/).
