In my browser inspect mode it not showing properly it showing almost half

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my code

<script>

  var tablinks = document.getElementsByClassName("tab-links")
  var tabcontents = document.getElementsByClassName("tab-contents")

  function opentab(tabname){
    for(tablink of tablinks){
        tablink.classList.remove("active-link");
      }
    for(tabcontent of tabcontents){
        tabcontent.classList.remove("active-tab");
      }
      event.currentTarget.classList.add("active-link");
      document.getElementById(tabname).classList.add("active-tab")
  }
</script>