Q:

site slogan in h6 following h2 site name not matching WCAG 2.0 requirements

Configuration : Drupal 7.26 / Omega 3 / Delta module
An accessibility check made with achecker.ca on a website gives me one result : 

Success Criteria 2.4.6 Headings and Labels (AA)
  
  Check 38: Header nesting - header following h2 is incorrect.
  Repair: Modify the header levels so only an h3 or any header less than h3 follows h2.
  Error Line 112, Column 7:

<h2 class="site-name"><a href="/fr" title="website homepage"><span>for ...
As I understand, it comes from the file : "sites/all/modules/delta/delta_blocks/includes/delta_blocks.theme.inc" The delta for the site slogan is defined as a h6, which doesn't match with WCAG 2.0 (AA) requirement : 

The header following an h2 is h1, h2 or h3

(http://achecker.ca/checker/suggestion.php?id=38).
So I might need to use a hook to change it, but I am such a newbie with hooks. I found this : https://api.drupal.org/api/drupal/modules!block!block.api.php/function/hook_block_info/7 but it seems to hook the core module. Not very sure I want to do it. 
Any help?

A:

Hooks won't help you with this - the markup for the slogan is in the region--branding.tpl.php template file:
<h6 class="site-slogan<?php print $class; ?>"><?php print $site_slogan; ?></h6>

To fix, you can just create your own region--branding.tpl.php file in your sub-theme, and alter the markup to your needs.

