If a screen-reader user completes the XHR demo, the text that confirms this is not read automatically.

https://amp-mk-1.herokuapp.com/examples.build/forms.amp.max.html

1. Fill out the XHR demo (bottom of page) correctly with a screen reader active.
2. select subscribe.
3. The page is updated with the success text, however the screenreader does not read it. You must manually navigate to the end of the page in order to discover whether you succeeded or not.

repros in Firefox/Chrome, likely effects all browsers.
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