changelog: add #10105

readme.txt

@@ -125,6 +125,7 @@ There are opportunities for developers at all levels to contribute. [Learn more
 
 **Improved compatibility**
 
+Shortcodes: update Mailchimp shortcode to match the new format offered by Mailchimp.
 
 **Bug fixes**
 

to-test.md

@@ -61,4 +61,23 @@ Then, try the following:
 7. (Wait a second or two)
 8. See that Jetpack Search is enabled.
 
+### Shortcodes
+
+#### MailChimp
+
+Mailchimp updated their newsletter embed code, and the old one does not work anymore.
+
+To test the changes, try the following:
+
+- As an admin, add the new embed code to a new post.
+- As a contributor, add the new embed code to a new post and save your draft. Watch the code convert into a shortcode.
+- Make sure the newsletter pop up appears on your site when you view the post.
+- Make sure no JavaScript errors appear in your browser console.
+
+If possible, try to create your own embed code as explained [here](https://jetpack.com/support/extra-sidebar-widgets/mailchimp-subscriber-popup-widget/). If not, here is an example embed code you can add to your post:
+
+```html
+<script type="text/javascript" src="//downloads.mailchimp.com/js/signup-forms/popup/unique-methods/embed.js" data-dojo-config="usePlainJson: true, isDebug: false"></script><script type="text/javascript">window.dojoRequire(["mojo/signup-forms/Loader"], function(L) { L.start({"baseUrl":"mc.us8.list-manage.com","uuid":"be06c2a596db91bfe4099fde8","lid":"08cf5fa008","uniqueMethods":true}) })</script>
+```
+
 **Thank you for all your help!**