MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/Popover_API/Using#auto_state_and_light_dismiss

What specific section or headline is this issue about?

auto state, and "light dismiss"

What information was incorrect, unhelpful, or incomplete?

The popover can be "light dismissed" — this means that you can hide the popover by clicking outside it or pressing the Esc key.

What did you expect to see?

This text conflates two separate concepts, light dismiss is the clicking outside to close behaviour, the escape key (and android back gesture) isn't part of this.

Do you have any supporting links, references, or citations?

whatwg/html#9373 (comment)

Do you have anything more you want to share?

The HTML spec itself might be ambiguous here and if so needs improvements too, but it feels right to correct it in MDN.

MDN metadata