@var{position} defaults to the current position of point in
@var{window}; @var{window}, to the selected window.
-If @var{position} is @code{t}, the last visible position in
-@var{window} is checked.
+If @var{position} is @code{t}, that means to check the last visible
+position in @var{window}.
The @code{pos-visible-in-window-p} function considers only vertical
scrolling. If @var{position} is out of view only because @var{window}
The argument @var{line} defaults to the current line in @var{window};
@var{window}, to the selected window.
-If the display is not up-to-date, @code{window-line-height} returns
+If the display is not up to date, @code{window-line-height} returns
@code{nil}. In that case, @code{pos-visible-in-window-p} may be used
to obtain related information.