Redmine

Which Redmine version you are using? I don't see any problem in Redmine 2.3.1. In the issue view (and also issues overview) you can set the style depending on the priority for issues and sub issues. In the issue view you have the priority class in <a>-tag but also in parent <div>-tag. More over you have no <tr>-Tag in the issue view, do you mean the issues overview?

I'm using redmine 2.2.2

Which parent div do you think about?
Maybe this has been introduced with redmine a later version.

• In the middle theres the mentioned a-tag with the priority of the sub issue

<div id="relations">
<div class="contextual">
  <a href="#" onclick="$('#new-relation-form').toggle(); $('#relation_issue_to_id').focus(); return false;">Hinzufügen</a>
</div>

<p><strong>Zugehörige Tickets</strong></p>

<form>
<table class="list issues">
<tbody><tr class="issue hascontextmenu" id="relation-123">
<td class="checkbox"><input name="ids[]" value="123" type="checkbox"></td>
<td class="subject">Beziehung mit 
    projektct - 
    <a href="/issues/123" class="issue status-9 priority-6 priority-high2">Task #321</a>: xxxx
</td>
<td class="status">Pending</td>
<td class="start_date">14.02.2013</td>
<td class="due_date"></td>
<td class="buttons"><a href="/relations/234" data-confirm="Sind Sie sicher?" data-method="delete" data-remote="true" rel="nofollow" title="Beziehung löschen"><img alt="Link_break" src="/images/link_break.png?1358712345"></a></td>
</tr>

I also using 'Redmine 2.2.2.stable'.
Image element like below...

<img alt="Edit" src="/redmine/images/edit.png?1358712345" />