Run results for: body vs querySelector

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:104.0) Gecko/20100101 Firefox/104.0

Browser: Firefox 104

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
document.body	3716882.0 Ops/sec
querySelector	2476755.0 Ops/sec
getElementsByTagName	2551688.0 Ops/sec

HTML Preparation code:

<!doctype html>

<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <title>A Basic HTML5 Template</title>
  <meta name="description" content="A simple HTML5 Template for new projects.">
  <meta name="author" content="SitePoint">

  <meta property="og:title" content="A Basic HTML5 Template">
  <meta property="og:type" content="website">
  <meta property="og:url" content="https://www.sitepoint.com/a-basic-html5-template/">
  <meta property="og:description" content="A simple HTML5 Template for new projects.">
  <meta property="og:image" content="image.png">

  <link rel="icon" href="/favicon.ico">
  <link rel="icon" href="/favicon.svg" type="image/svg+xml">
  <link rel="apple-touch-icon" href="/apple-touch-icon.png">

  <link rel="stylesheet" href="css/styles.css?v=1.0">

</head>

<body>
  <!-- your content here... -->
  <script src="js/scripts.js"></script>
</body>
</html>

Tests:

document.body
document.body
querySelector
document.querySelector('body')
getElementsByTagName
document.getElementsByTagName('body')[0]

Run results for: body vs querySelector

document.body

querySelector

getElementsByTagName