Tabular vertical heading spacing issue

[Andrew Scholer]

I have a spacing issue with vertical headers that have borders. There is a 2em left padding applied to vertical headings.This prevents them from properly aligning with centered content in their column. (See below.)

If the cell does not have a border, there is a separate rule that overrides that padding and with smaller, equal left and right padding. This is the case for all the examples in the SA, so the issue is not visible there.  

I think that small, equal amounts of padding should be used in all cases. Just want to make sure there is not some rationale for the larger, left only padding that I am missing.

Sample

Behavior without borders from SA:

[Rob Beezer]

Dear Andrew,

Short answer: I don't recall s whole lot of care going into the placement of the
vertical headers.

Notes:

* Not finding relevant commits too well.

* What is the LaTeX output doing?

* For row/@header="yes" do @halign and/or @valign make sense? I suspect they
would be easy to pass along as classes. (Again: LaTeX?)

Rob

On 2/14/26 11:54, Andrew Scholer wrote:
> I have a spacing issue with vertical headers that have borders. There is a 2em
> left padding applied to vertical headings.This prevents them from properly
> aligning with centered content in their column. (See below.)
>
> If the cell does not have a border, there is a separate rule that overrides that
> padding and with smaller, equal left and right padding. This is the case for all
> the examples in the SA, so the issue is not visible there.
>
> I think that small, equal amounts of padding should be used in all cases. Just
> want to make sure there is not some rationale for the larger, left only padding
> that I am missing.
>
> Sample

> image.png
>
>
> Behavior without borders from SA:

> image.png
>
>
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[Andrew Scholer]

Thanks Rob.

LaTeX has IMO much better output. Both in terms of spacing and orientation. In LaTeX the title runs up from the data, which to my eye is preferable. (Both specify "90 degrees" in the output, but the engines disagree on the direction of angle measurement.)

row@halign or @valign on vertical headers is a bit of a mess.

In HTML, you have to use @halign on the header to control what is visually the vertical alignment. Yes, technically the text is being left/right aligned within its rotated context, but given that the alignment is specified on the row or cell, and not the contents, I think @valign makes more sense.

In LaTeX, halign is ignored and valign breaks the output.

For anyone who wants to play along at home:
https://gist.github.com/ascholerChemeketa/91b3d2c6f379625f7d5004535c407626

I would be happy to do a PR making HTML out of the box behavior look like LaTeX. (And ignore @Xaligns.)

If you want to dive into @Xaligns in vertical headers, I'm happy to handle HTML output. Someone else would have to opine on the one true way to implement that alignment in LaTeX. 

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