Sitefinity: CSS, JavaScript & Embed Code
In Sitefinity, the CSS, JavaScript and Embed Code "static content" widgets can be used to add custom styling and/or scripting functionality to a page or page template that isn't readily available out of the box.
Each of these widget types can be found in the "Scripts and Styles" section of the Content widgets toolbox.
Styles - CSS Widget
Cascading Style Sheets
The CSS widget is used to add Cascading Style Sheets (CSS) to your pages. You can either write CSS in the widget or link to an external stylesheet hosted elsewhere such as a CDN. Click the "Edit" button in the upper-right corner of the widget to modify it.
Scripts - JavaScript Widget
Client-Side Scripting
The JavaScript widget is used for adding JavaScript (JS) to your pages. You can either write JS in the widget or link to an external script hosted elsewhere such as a CDN. Click the "Edit" button in the upper-right corner of the widget to modify it.
Misc - Embed Code Widget
Generic / Raw Code Placement
The Embed Code widget is used to add custom CSS, JS, iframes, videos, and/or other types of embedded content to your pages. You must include all necessary script tags with this widget as it will drop raw code directly on the page wherever the widget is placed. Click the "Edit" button in the upper-right corner of the widget to modify it.