Hello,

There seems to be quite a bit of confusion.

On Tue, Sep 18, 2018, 6:51 AM Martin Dalgaard Villumsen <
mvillumsen@health.sdu.dk> wrote:

> I am not interested in editing the exported HTML file (conflicts the point
> of using org-mode)
>
I did not say that HTML should be edited manually. I said that ox-html
probably needs an update that inserts the col tag with user-specified
col-classes.

>  I can add a class to the <table> tag with
>
> #+ATTR_HTML: :class my-table
>

Correct. That class won't help here. You need a class that scopes the
individual columns.

>  But I don’t know how to add a new class to <col> in org-mode; or how to
> define a custom column (one that is now <r>, <l>, <c>).
>
Right, that needs to be investigated. Most likely, at the moment, we cannot
set individual classes for each column.

> No point in CSS-restyling default class="org-center", class="org-left",
> etc.  … this would affect columns in other tables
>
That's a CSS problem. You can set a unique class for a table using the
attr_html syntax you showed above and then set CSS rules only for that
table using ".my-table td+td" and so on.

The org-* classes you mentioned can be easily overridden or used along with
the new classes, based on how the CSS rules are written.

>