Opera already provides the last 2 features, which I need for reading comfortably. (Other browsers can auto-fit text while zooming, but they lack night mode, and vice-versa: Yandex has fit-text but no night mode, Vivaldi has the night mode, can even hide the the status bar (top bar), but its option to "Force enable zoom" doesn't provide the auto-fitting text.)
Auto-fit changes the number of lines (and of words per line) in order to keep the text in view and allow the flow of reading while zooming in:
while normal zoom (e.g. in Chrome) doesn't change the number of words per line and thus hides part of the words in each line when zooming in:
Night mode is also present in Opera and other browsers but absent in Chrome:
Fullscreen would mean hiding the Android top tab and (ideally) also the bottom buttons, the way an ebook reader or a video player does..
Are there Android browser that have all these three capabilities?
auto-fit text when zooming
night mode setting (dark background for text)
fullscreen page, like in a pdf or ebook reader, or by hiding at least the top bar