Reason to include javascript with document.write

Question

I started working on a project a came across a strange way to include a CSS file using javascript.

Example from the project:

document.write('<link rel="stylesheet" type="text/css" href="css/plugins/jquery.datatables.css" />');

Is there any reason (advantage) to include the file this way?

Answer 1

The CSS file will only be added to the page if the user has JavaScript enabled. Bandwidth saver.

Answer 2

This code does not include JavaScript but the CSS include...by using JavaScript. It allows to dynamically select your CSS maybe to select themes or adapt layout to the device.