E009 - 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!
Button and input sizing within .input-groups can cause issues. Instead, use input group sizing classes .input-group-lg or .input-group-sm
Wrong:
<div class="input-group">
  <span class="input-group-btn">
    <button class="btn btn-default btn-lg" type="button">Go!</button>
  </span>
  <input type="text" class="form-control input-lg" />
</div>Right:
<div class="input-group input-group-lg">
  <span class="input-group-btn">
    <button class="btn btn-default" type="button">Go!</button>
  </span>
  <input type="text" class="form-control" />
</div>