Is it wrong to place the

html

responsive-design

performance

best-practices

byAlex Kataev·Oct 26, 2024

Placing your <script> tag outside of <body> or <head> can lead to HTML validation errors. For performance optimization and maintaining code standards, it's best to place <script> just before the closing </body> tag:

<!-- You want your script here... -->
<body>
  <!-- HTML beast mode ON -->
  <script src="your-data-nom-nom.js"></script>
</body>
<!-- ...not in the no man's land here -->

This approach ensures faster page rendering and sticks to the proper HTML structure.

Importance of positioning

The position of your <script> tag within your <body> or <head> can alters HTML validity. Internet Explorer, though aging, will ignore this script section completely. Although WebKit browsers can handle some broken HTML placements, it's better not to rely on their error recovery process.

Performance Optimisation

To ensure efficiency, minimise parsing times and maintain optimal page load speeds, HTML standards must be maintained. Browsers prefer <script> tags placed just before the </body>, which facilitates more efficient rendering and loading processes for a better user experience.

SEO implications and promising future

Incorrect placement of <script> tags can nudge your SEO ranking downwards due to poor coding practices. Future browser support for unconventional script tag placements remains uncertain. As a responsible web developer, adhering to best practices is your ticket to broad compatibility and SEO fairness.

Pinpointing optimal load techniques

Defer or async — pick your weapon!

When placing scripts in the <head>, you get two powerful attributes to control JavaScript execution: defer and async. Choose your load strategy well:

Using defer runs the script only after the entire document (DOM) gets fully parsed.
The async attribute lets your script run as soon as it gets downloaded, never mind the document parse status.

The ripple effect—the rest of the page

The placement of your scripts could affect interaction with other elements on your page. Make sure that all the DOM elements the scripts depend upon are available. Best not to bungee jump without a rope, right?

Delivering for larger scripts

For larger scripts that can hamper performance, incorporate advanced methods like lazy loading or splitting the script into small modules. This doesn't only improve initial load times, but it's also a sure shot way to boost interactivity and user responsiveness.