Hiding multiple elements when CSS changes

I have a few buttons I am using as tags. I would like to check whether the tags are visible and if ALL tags are hidden, then hide the clear selection link. MY HTML IS:

 <div class="col-xs-12 col-sm-5 cols">
      <div id="tags">
      <button type="button" class="btn btn-default usertitle-tag hide-tag tg-btns">x &nbsp;&nbsp;Usertitle</button>
      <button type="button" class="btn btn-default comments-tag hide-tag tg-btns">x &nbsp;&nbsp;Comments</button>
      <button type="button" class="btn btn-default topics-tag hide-tag tg-btns">x &nbsp;&nbsp;Topics</button>
      <button type="button" class="btn btn-default login-tag hide-tag tg-btns">x &nbsp;&nbsp;Login</button>
       <a href="#" class="cancel clear">Clear selection</a>
        </div> <!--/.col-xs-12-->

I have tried this with jquery but the clear selection is still visible. Where am I going worng?

     if ( $(this).css('display') == 'none'){


You can set the visibility to true if at least one hide-tag is visible like


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