Re: Embedding images as data: URIs in the HTML exporter (was: MathJax is now the default for HTML math)

From: David Maus <dmaus@ictsoc.de>
To: "Jan Böcker" <jan.boecker@jboecker.de>
Cc: emacs-orgmode List <emacs-orgmode@gnu.org>,
	Carsten Dominik <carsten.dominik@gmail.com>
Subject: Re: Embedding images as data: URIs in the HTML exporter	(was: MathJax is now the default for HTML math)
Date: Sun, 26 Sep 2010 20:51:29 +0200	[thread overview]
Message-ID: <87aan4ibim.wl%dmaus@ictsoc.de> (raw)
In-Reply-To: <4C8119DD.3030408@jboecker.de>

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Jan Böcker wrote:
>On 09/03/2010 05:07 AM, sand@blarg.net wrote:
>> How about doing the same data: URI embedding for images in the HTML
>> exporter?  It should be possible to implement it entirely inside
>> Emacs.  It would have to be optional, of course.
>> 
>> Derek
>> 

>This is certainly possible, the following patch would do this to *every*
>image. Maybe someone who knows the HTML exporter code better than I do
>can make it configurable and submit a patch.

>Bonus points for an extra option which only embeds images smaller than
>32 KB to keep it compatible with Internet Explorer.

The main problem I see here is, that it is not very well supported.
Especially IE below 8 does not support it at all and IE8 seems to
support data URIs in CSS style sheets, only.

Quote from https://developer.mozilla.org/en/data_URIs (Common
problems):

"The data scheme is supported by Opera 7.20 and above, as well as
Safari and Konqueror. Internet Explorer 7 and below, however, do not
currently support it. Internet Explorer 8 and above only supports data
URIs for images in CSS."

Moreover this technique is somewhat problematic because it defeats
some caching mechanism, and will enlarge the resulting page -- not
very kind for people with small bandwith and/or paying by traffic.

I think something supporting this could go to hacks or contrib with a
big red warning about the consequences and a careful discussion of
when to use this and when best not to use it.

Best,

 -- David

PS: There is
http://www-archive.mozilla.org/quality/networking/testing/datatests.html
that lets you test your browser for the support of content included in
data URIs.

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