Why would you give a style tag an id

Question

Hi have noticed a few sites that give the style tag an id such as:

Can anyone explain firstly why y

Answer 1

So you can reference it (just like any other element), i.e.

var styles = document.getElementById('style-id');
// do anything you want, like
styles.parentNode.removeChild(styles); // remove these styles
styles.setAttribute('href', 'alternate-styles.css'); // change the style