[Snippet] CSS - Child element overlap parent

I searched from somewhere and found that a lot of people says a basic concept for implementing this feature looks like below:
HTML code:

<div id="parent">
 <div id="child">

 </div>
</div>

And, CSS:

#parent{
  position: relative;
  overflow:hidden;
}

#child{
  position: absolute;
  top: -1;
  right: -1px;
}

However, I had a lot of grand-parents in my case and the above code didn't work. Therefore, I needed an alternative. I presumed that my app uses Boostrap and AngularJs, maybe some CSS from them affects mine. I didn't know exactly the problem, but I believed when all CSS is loaded into my browser, I could completely handle it.

www.tom-collinson.com

I tried to create an example to investigated this problem by Fiddle. Accidentally, I just changed: position: parent; to position: static; for one of parents -> the problem is solved.
Look at my code:

<div class="modal-body dn-placeholder-parent-position">
  <div class="form-horizontal">
    <div class="form-group">
      <label class="col-sm-2">Name</label>
      <div class="col-sm-9">
       ....
      </div>
    </div>
    <div class="form-group">
     <label class="col-sm-2">Help text</label>
     <div class="col-sm-9">
      ...
     </div>
     <div class="col-sm-3 dn-placeholder-position">
        <dn-placeholder>
         ....
        </dn-placeholder>
     </div>
    </div>
   </div>
</div>

CSS

.dn-placeholder-parent-position{
    position: static;
}

.dn-placeholder-position{
    padding: 0px;
    margin-top: 7px;
    position: absolute;
    right: -93px
}

Can check my example here: https://jsfiddle.net/qo44z771/


References:

[1]. http://front-back.com/how-to-make-absolute-positioned-elements-overlap-their-overflow-hidden-parent
[2]. http://stackoverflow.com/questions/14605639/how-to-overlap-parent-div-from-child-div