im making a function will clipboard each <span class="tag">Value</span> by className

When i tested it was fine on console but it's not copying anthing to clipboard, may i know the issue where exactly?

the code here

<script type="text/javascript">
  document.getElementById("copy_hashtags").addEventListener("click", copytags);
  function copytags() {
      var tags = document.querySelectorAll('.tag');
      var result = [];
      for(var i = 0; i < tags.length; i++) {
          result.push(tags[i].innerText);
      }
      result = result.join(' ');
      copyToClipboard(result);
       console.log(result);
      }
</script>