Производительность загрузки страницы

  1. Вариант

PHP
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11
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Script at the end of page</title>
  </head>
  <body>
    <!-- All the HTML content here -->
    <script src="index.js"></script>
  </body>
</html>

2. Вариант

PHP
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11
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Script with async attribute</title>
    <script async src="index.js"></script>
  </head>
  <body>
     <!-- All the HTML content here -->
  </body>
</html>

3. Вариант

PHP
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11
<!DOCTYPE html>
<html lang="en">
  <head>
<meta charset="UTF-8" />
<title>Script with defer attribute</title>
<script defer src="index.js"></script>
  </head>
  <body>
<!-- All the HTML content here -->
  </body>
</html>