Bottom margin vs. descenders question

[David Carlisle]

tex has a parameter \maxdepth (for the main page) (and \boxmaxdepth for
other boxes being constructed) that sets how far you are allowed to go
below. If the descenders on the last row are bigger than \maxdepth then the
row doesn't fit and the page breaks earlier (or shrinks more or whatever)
latex and plain set \maxdepth to 4pt by default so normal letter descenders
don't affect the position of the last row.

David

On Thu, 25 Jun 2020 at 05:24, Doug McKenna <doug at mathemaesthetics.com>
wrote:

> Dear typesetting cogniscenti,
>
> In "official typesetting rules" (TeX or otherwise) are descenders supposed
> to be completely above the bottom margin bounds of a page?  Or is just the
> baseline of the bottom line of a full page supposed to conform to the
> margin bounds?
>
> Doug McKenna
> Mathemaesthetics, Inc.
>
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