Re: Org 9.5 broke the rendering of my SVG images

[Chris Clark]

Would the HTML <svg> tag be appropriate in this case?

For example, here's a tiny example of using the <svg> tag with an external CSS stylesheet: https://plnkr.co/edit/i8RFDW?preview

On Fri, Oct 14, 2022 at 4:32 AM Ihor Radchenko <yantar92@gmail.com> wrote:

Alexandre Duret-Lutz <adl@lrde.epita.fr> writes:

> In Org 9.5, SVG images started being exported by the HTML exporter as
> <img> rather than <object>.
>
> The patch causing that was
>   https://list.orgmode.org/87k0pemj6d.fsf@gmail.com/T/
> with two arguments:
> 1) <object> do not have an alt attribute
> 2) <object> will not render some SVG file correctly if it has no viewBox
>    (I'm assuming that the issue shown in that message is a missing viewBox).
>
> The reason I've noticed this change is that it broke my web pages.  On
> my pages, I use SVG to display many automata, and they all share a
> common stylesheet.  That stylesheet is not inlined into the SVG, rather,
> it is a separate file included in the SVG files with
>   <?xml-stylesheet href="" type="text/css"?>
> so that the browser only need to download it once.
>
> Infortunately, <img> does not allow external stylesheets to be
> processed, so my stylesheets are now ignored.  Note that one can also
> build SVG images that include other SVG images, or SVG images that have
> animations that start when you hover on some elements.  All those
> usages would break with <img>.
>
> I've seen that very issue was discussed back in 2016
> https://list.orgmode.org/871t2iq353.fsf@iki.fi/T/
> where Christian Moe pointed out exactly this:
>
>> (2) You can also do other things with <object> that you cannot with
>> <img>, like manipulating the SVG with _javascript_ and styling it with
>> an external stylesheet (linked from the SVG, not the web page).
>
> So in the interest of allowing users to build documents where SVG
> files are not static, self-contained images, it seems to me that Org
> probably needs some way to specify whether SVG images should be
> exported as <img> or <object> (or maybe even inlined).

Confirmed.
This is clearly a regression and should be fixed.

--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
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