HTML and CSS Certification 2025 – 400 Free Practice Questions to Pass the Exam

Placing JavaScript at the end of the body section is optimal for performance because it allows the browser to load and render the HTML content first before executing any scripts. When JavaScript is loaded at the end, it ensures that the page structure is fully built, which can lead to a better user experience as visitors can see and interact with the page while scripts load in the background. This practice minimizes delays caused by script execution, especially for larger scripts or when multiple scripts are being loaded.

Loading scripts in the head section can block rendering of the page, as the browser must download and execute the script before it continues to load the rest of the page. Similarly, placing JavaScript at the beginning of the body section can cause similar delays. When JavaScript is placed inside CSS stylesheets, it would not function correctly because CSS and JavaScript serve different purposes, and CSS is meant for styling, not scripting. Thus, positioning JavaScript at the end of the body section strikes an ideal balance between functionality and performance.