What is the reasoning behind placing the CSS file in the header section and the JS file at the bottom

Hey there, I need some help. Why is the CSS file included in the header section but the JS file at the end of the page? Can I also include the CSS file at the bottom of the page?

<!DOCTYPE html>
<html>
    <head>
        <link type="text/css" href="myFolder/style.css" rel="stylesheet">
        </link>
    </head>
    <body>
        <div>
            <p>First paragraph in the div.</p>
            <p>Second paragraph in the div.</p>
        </div>
    </body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
</html>
css

Answer №1

When a web browser encounters a reference to an external resource within a tag, it will pause parsing the HTML, fetch and execute the script, and then resume parsing. On the other hand, when it encounters a link to an external stylesheet, it will continue parsing while fetching the CSS file in parallel.

The common advice to prioritize stylesheets at the top of the page and scripts at the bottom is rooted in the concept of progressive rendering, which plays a crucial role in enhancing user experience.

Traditionally, by placing stylesheets first, they would download first, allowing the first script to load simultaneously for faster rendering. However, most modern browsers now utilize speculative parsing, preemptively downloading resources before executing scripts.

For more information, you can visit this helpful link: Why CSS First

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