JSFiddle - React, Tailwind, and code Playground

HTML

<h3>Seconds Display:</h3>

<p id="secondsHidingText">Hiding seconds extends battery life</p>&nbsp&nbsp
<input type="radio" name="seconds" value="show" checked="checked">Show&nbsp&nbsp
<input type="radio" name="seconds" value="hide">Hide

JavaScript

$(document).ready(function(){
  var radios = document.getElementsByName("seconds");
  var val = localStorage.getItem('seconds');
  for(var i=0;i<radios.length;i++){
    if(radios[i].value == val){
      radios[i].checked = true;
    }
  }
  $('input[name="seconds"]').on('change', function(){
    localStorage.setItem('seconds', $(this).val());
  
  });
});