Merge pull request #312605 from bernawy/patch-71

Update date and add Bootstrap dependency notice

Author: prmerger-automator[bot]

articles/active-directory-b2c/customize-ui-with-html.md

@@ -6,7 +6,7 @@ author: kengaderdus
 manager: CelesteDG
 ms.service: azure-active-directory
 ms.topic: how-to
-ms.date: 02/17/2025
+ms.date: 03/04/2026
 ms.author: kengaderdus
 ms.subservice: b2c
 zone_pivot_groups: b2c-policy-type
@@ -440,6 +440,34 @@ To use the sample:
 1. Now modify the policy, pointing to your HTML file, as mentioned previously.
 1. If you see missing fonts, images, or CSS, check your references in the extensions policy and the `\*.html` files.
 
+
+### Bootstrap dependency in sample templates
+
+The [sample templates](https://github.com/azure-ad-b2c/html-templates) use **Bootstrap 3.3.5**, sourced from the official Bootstrap CDN. This version has been validated and tested with Azure AD B2C.
+
+The templates reference the following CDN URL for Bootstrap CSS:
+
+  ```
+  https://cdn.jsdelivr.net/npm/bootstrap@3.3.5/dist/css/bootstrap.min.css
+  ```
+
+The default configuration in the template HTML files includes a link element similar to the following example:
+
+  ```xml
+  <link href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.5/dist/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
+  ```
+
+For the official Bootstrap 3.3.5 download and CDN details, see [Bootstrap 3.3 Getting Started](https://getbootstrap.com/docs/3.3/getting-started/#download-cdn).
+
+#### Replace the CDN reference
+
+You can replace the CDN reference with your organization's internal CDN or a locally hosted copy to meet reliability, security, or compliance requirements.
+
+> [!IMPORTANT]
+> The templates are validated specifically against Bootstrap 3.3.5. Upgrading, downgrading, or otherwise modifying the Bootstrap version might introduce styling, layout, or component compatibility issues.
+
+If you change the Bootstrap version, you're responsible for completing regression testing to validate that your customized templates work correctly with Azure AD B2C. Retain the validated version unless you've completed appropriate testing.
+
 ## Use company branding assets in custom HTML
 
 To use [company branding](customize-ui.md#configure-company-branding) assets in a custom HTML, add the following tags outside the `<div id="api">` tag. The image source is replaced with that of the background image and banner logo.