Corporation made word processing machines that had a white vidmate screen with black text. This was done in order to replicate the look of ink on paper.
I have also tested autofill with Keepass2Android and Enpass - both work in Firefox but do not in Chrome (stable and beta).(Nexus 5X on PixelExperience, Android 9).
The local storage here means your inbuilt storage. Get more info about this on the support page. It's one of the most asked questions of all.
Regards,
KAsey.