How to add preloader in html page

$(window).on('load', function() { // makes sure the whole site is loaded 
  $('#status').fadeOut(); // will first fade out the loading animation 
  $('#preloader').delay(350).fadeOut('slow'); // will fade out the white DIV that covers the website. 
  $('body').delay(350).css({'overflow':'visible'});
})

Preload html

<head>
  <meta charset="utf-8">
  <title>JS and CSS preload example</title>

  <link rel="preload" href="style.css" as="style">
  <link rel="preload" href="main.js" as="script">

  <link rel="stylesheet" href="style.css">
</head>

<body>
  <h1>bouncing balls</h1>
  <canvas></canvas>

  <script src="main.js" defer></script>
</body>

Source: developer.mozilla.org

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