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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Horizontal centering in the display engine
Date: Tue, 13 Apr 2021 21:39:25 +0300
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> From: sbaugh@catern.com
> Date: Tue, 13 Apr 2021 14:25:14 -0400
> 
> The display engine supports display text left-aligned and right-aligned.

What do you mean by "right-aligned"? can you give an example of such
an alignment?

> far as I can tell, it doesn't support displaying text centered.

Doesn't :align-to display spec allow to solve this problem?  Or maybe
I don't understand the use case well enough?