The burden of a CSS or jQuery file

Having trouble finding the right keyword to search for the answer to my question on Google, I've decided to ask it here instead. If I only use a portion of the classes or IDs from Bootstrap CSS or any other framework in my HTML file, will all the CSS still load? Will this cause my website to load slower as a result? And what about jQuery?

Answer №1

Your website will always download the entire library.
However, there is a potential solution to reduce loading delays. Utilize a Content Delivery Network (CDN), similar to this example for Twitter:

<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />

or

<script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

By implementing this approach, it increases the likelihood that users have previously visited websites utilizing the same libraries you are using, resulting in cached files for bootstrap, jquery, or other popular libraries already stored in their memory.

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