We are excited to announce the release of support for building announcement bar extensions on the Thank You page and Customer Account pages, including the Order Status page, Order Index page, and Profile page. The announcement bar is a new UI-extension form factor that uses prominent placement, animation, and colors to capture buyers' attention. With this feature, you can create extensions that highlight a merchant's most important tasks on the page, such as surveys, reviews, and upsells.
This is a companion discussion topic for the original entry at https://shopify.dev/changelog/build-an-announcement-bar-extension-for-the-thank-you-page-or-customer-account-pages