From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kodi Arfer <kodi@arfer.net>
Subject: Re: Bug with automatic alignment of table columns in HTML export
Date: Tue, 19 Mar 2013 15:39:22 -0400
Message-ID: <5148BEEA.6000702@arfer.net>
References: <5145DC81.2070905@arfer.net> <87ehfbrzil.fsf@bzg.ath.cx>
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To: Bastien <bzg@altern.org>
Cc: emacs-orgmode@gnu.org

On 2013 Mar 19 Tue 1:26:13 PM -0400, Bastien <bzg@altern.org> wrote:
> Hi Kodi,
>
> Kodi Arfer <kodi@arfer.net> writes:
>
>> Consider an Org file with the following content:
>>
>> |   a | b |
>> |-----+---|
>> | 100 | 1 |
>> |   1 | 1 |
>> |     | 1 |
>> |     | 1 |
>> |     | 1 |
>> |     | 1 |
>> |     | 1 |
>> |     | 1 |
>>
>> Within Emacs, Org right-aligns the left column, as it should, since most
>> nonempty cells in the column are numeric. In HTML export, though (starting
>> from "emacs -Q -l /tmp/minimal-org.el"), the column comes out
>> left-aligned. The problem seems to be with how the exporter treats empty
>> cells, since if you put numbers in all the empty cells above, the column
>> comes out right-aligned in HTML export.
>
> Fixed, thanks.

You're quite welcome. That was prompt! I see this case now works in 
master. The catch is that there are still some cases which give 
inconsistent alignment between Emacs and HTML export, such as:

|   a | b |
|-----+---|
| 100 | 1 |
|   1 | 1 |
|   1 | 1 |
|   1 | 1 |
|   a | 1 |
|     | 1 |
|     | 1 |
|     | 1 |
|     | 1 |
|     | 1 |
|     | 1 |

I believe the heuristic used for in-buffer display is that empty cells 
are ignored entirely when doing the comparison against 
org-table-number-fraction.