Can you test what `table-layout: fixed` looks like on this Firefox alpha? It has other issues; I would definitely prefer an auto layout so the description column gets more space, but if its auto layout determines to put 3 characters per line... maybe it is the best we can do.

In my opinion, even the old behavior is a bug (see bug #66726).
In this case, it's probably a good idea to remove the description
column from the table, and to lay out the information like the ini
directive docs (e.g.
<http://php.net/manual/en/filesystem.configuration.php>).

Here is what the table looks like when applying table-layout: fixed in Firefox 63 alpha https://imgur.com/a/7YIQBXl

Sorry, I forgot to apply table-layout: fixed to the Changelog table in the image in my previous comment. When appling table-layout: fixed on that table, it gets split 50/50 between the two columns.

Here is an updated image: https://imgur.com/64a3CwV

Alternative approaches to mitigate this a bit:

1. Using CSS word wrapping/breaking rules (prefered by me):

.doctable td {
  word-break:break-word; /* or even 'break-all' */
  /* also word-wrap: as behavior differs a bit between browsers. */
}

.doctable td:nth-child(1) {
  word-break:keep-all; /* to avoid breaking keywords mostly in firt column */
}

If the cells would have some class this would even be better because then can be defined by CSS which cells content can be wrapped on narrow displays and which better not.


2. Using grid layout CSS rules for arranging the cells of a doctable row into a grid:

Another approach would be to use alternate rendering of the table columns using e.g. css grid layout templates for the table rows for small displays. (probably too complex for now as number and type of columns differs through the documentation an topics, maybe first set consistent css class attributes for the td first)

example css transformation  of a tr row by grid layout

https://www.php.net/manual/en/filter.filters.validate.php
 
-------------------------------
| id | name | options | flags |
-------------------------------
|         description         |
-------------------------------