E026 - Herst/bootlint-ng GitHub Wiki
Note: Below is the original page from the Bootlint documentation, some of the info here might not apply to Bootlint-NG!
A .panel-title must be a direct child of its .panel-heading. No levels of intervening elements are permitted between the .panel-title and the .panel-heading.
Wrong:
<div class="panel panel-default">
  <div class="panel-heading">
    <div class="my-super-special-wrapper">
      <h3 class="panel-title">Panel title</h3>
    </div>
  </div>
  <div class="panel-body">
    Panel content
  </div>
</div>Right:
<div class="panel panel-default">
  <div class="panel-heading">
    <h3 class="panel-title">Panel title</h3>
  </div>
  <div class="panel-body">
    Panel content
  </div>
</div>