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<button>
  <span class="visually-hidden">Help!</span> <!-- add visually hidden for screen readers -->
  <i class="icon icon-help" aria-hidden="true"></i><!-- add aria-hidden true -->
</button>



<script><
/** from html5 boilerplate */
.visually-hidden {
   border: 0;
   clip: rect{0,0,0,0);
   height: 1px;
   margin: -1px;
   overflow: hidden;
   padding: 0;
   position: absolute;
   width: 1px;
   }
</script?