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                <!DOCTYPE html>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width">

    <title>Silly story generator</title>

    body {
      font-family: helvetica, sans-serif;
      width: 350px;
    label {
      font-weight: bold;  
    div {
      padding-bottom: 20px;
    input[type="text"] {
      padding: 5px;
      width: 150px;
    p {
      background: #FFC125;
      color: #5E2612;
      padding: 10px;
      visibility: hidden;

      <h1>Silly story generator</h1>
      <label for="customname">Enter custom name:</label>
      <input id="customname" type="text" placeholder="">
      <label for="us">US</label><input id="us" type="radio" name="ukus" value="us" checked>
      <label for="uk">UK</label><input id="uk" type="radio" name="ukus" value="uk">
      <button class="randomize">Generate random story</button>
    <p class="story"></p>

   <script src="storygen.js"></script> 




                var customName = document.getElementById('customname');
var randomize = document.querySelector('.randomize');
var story = document.querySelector('.story');

function randomValueFromArray(array){
  return array[Math.floor(Math.random()*array.length)];


var storyText = 'It was 94 fahrenheit outside, so :insertx: went for a walk. When they got to :inserty:, they stared in horror for a few moments, then :insertz:. Bob saw the whole thing, but was not surprised — :insertx: weighs 300 pounds, and it was a hot day.'

var insertX = ['Willy the Goblin', 'Big Daddy', 'Father Christmas'];
var insertY = ['the soup kitchen', 'Disneyland', 'the White House'];
var insertZ = ['spontaneously combusted', 'melted into a puddle on the sidewalk', 'turned into a slug and crawled away'];


randomize.addEventListener('click', result);

function result() {

  var newStory = storyText;

  var xItem = randomValueFromArray(insertX);
  var yItem = randomValueFromArray(insertY);
  var zItem = randomValueFromArray(insertZ)

  var newStory = newStory.replace(':insertx:', xItem);
  var newStory = newStory.replace(':inserty:', yItem);
  var newStory = newStory.replace(':insertz:', zItem);

  var newStory = newStory.replace(':insertx:',xItem);

  if(customName.value !== '') {
    var name = customName.value;
    var newStory = newStory.replace('Bob', name);

  if(document.getElementById("uk").checked) {
    var weight = Math.round(300/14) + ' stone';
    var temperature =  Math.round((94-32)*(5/9))  + ' centigrade';

    var newStory = newStory.replace('300 pounds', weight);
    var newStory = newStory.replace('94 fahrenheit',temperature);

  story.textContent = newStory; = 'visible';