gistfile1.txt

<div >
  <button onclick="openTabs('Description')">Description</button>
  <button  onclick="openTabs('Reviews')">Reviews</button>
  <button onclick="openTabs('Shipping')">Shipping Policy</button>
</div>
     <div style="margin:10px 0;" id="Description" class="tab">
  <h2>Description</h2>
{{ product.description }}
</div>

<div style="margin:10px 0;display:none" id="Reviews" class="tab" >
  <h2>Reviews</h2>
<div id="shopify-product-reviews" data-id="{{product.id}}">{{ product.metafields.spr.reviews }}</div>
</div>

<div  style="margin:10px 0;display:none;" id="Shipping" class="tab" >
  <h2>Shipping Policy</h2>
  {{pages['shipping-policy'].content}}
</div>

      <script>

        function openTabs(tabName) {
  var i;
  var x = document.getElementsByClassName("tab");
  for (i = 0; i < x.length; i++) {
    x[i].style.display = "none";
  }
  document.getElementById(tabName).style.display = "block";
}
      </script>