On Sat, May 25 2024, Eli Zaretskii wrote:
> This could be improved:
>
>   @item a number @var{n}
>   @itemx a string of the form @samp{@var{n}ex}

Done.

>> +@item a string of the form @samp{@var{n}px}
>> +A width of @var{n} pixels.
>    ^^^^^^^
> "The width", I guess?  Or maybe just "@var{n} pixels"?

"@var{n} pixels" seems best, I think.