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Hello,
When exporting to html an image for which I added a class attribute, the
result seems to depend on the fact that I insert or not an empty line
after the image link. Example :

with this text in my org file :

    * Le sens des math
 #+ATTR_HTML: :class vignette
    [[file:logo_utl.jpg]]

    [[file:utltb.org][UTL-TB]]
    (Université du Temps Libre de Tarbes et Bigorre)

I get the following html code :

    <div id="outline-container-org4aefefe" class="outline-2">
        <h2 id="org4aefefe">Le sens des math</h2>
        <div class="outline-text-2" id="text-org4aefefe">
            <figure>
              <img src="logo_utl.jpg" alt="logo_utl.jpg" class="vignette">
              <br>
            </figure>
        <p>
            <a href="utltb.html">UTL-TB</a>
    <br>(Université du Temps Libre de Tarbes et Bigorre)<br>

and with this text (no blank line in the middle) :

    * Le sens des math
#+ATTR_HTML: :class vignette
    [[file:logo_utl.jpg]]
    [[file:utltb.org][UTL-TB]]
    (Université du Temps Libre de Tarbes et Bigorre)

I get :

    div id="outline-container-org4aefefe" class="outline-2">
    <h2 id="org4aefefe">Le sens des math</h2>
    <div class="outline-text-2" id="text-org4aefefe">
    <p class="vignette">
    <img src="logo_utl.jpg" alt="logo_utl.jpg" class="vignette">
    <br>
    <a href="utltb.html">UTL-TB</a>
    <br>(Université du Temps Libre de Tarbes et Bigorre)<br>


In the second case the class attribute have been added both to <p> and
<img> tags, which is not what I xant.
Is it always necessary to separate the link from the rest of the text with a
blank line ?

(Sorry, I didn't find in documentation a way to format code in the
mail. I hope it is readable)

Thanks a lot for your help

Michel

Emacs  : GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2017-09-20 on lcy01-07, modified by Debian
Package: Org mode version 9.1.6 (9.1.6-44-ge6f891-elpa @ /home/michel/.emac=
s.d/elpa/org-20180212/)