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defer attribute for external scripts

98.42

DOM HTML5

The boolean defer attribute on script elements allows the external JavaScript file to run when the DOM is loaded, without delaying page load first.

Further reading:

  1. Can I use page for: defer attribute for external scripts
  2. MDN Web Docs - Script Attributes
  3. has.js test
  4. WebPlatform Docs
  5. async vs defer attributes