The YUI framework offers support in a wide range of areas, including animation, buttons, calendars, charts, colors, cookies, drag and drop, fonts, imaging, menus, styles, uploading, and a great deal more as well.
To find features you need, check out the examples down the left of the main index.html page in the downloaded distribution or at http://developer.yahoo.com/yui and click on ones that interest you.
For example, clicking through to the calendar link reveals how you can make your own calendars, a common feature needed by many websites. Here’s how you can recreate the calendar example shown at:
To do so, locate all the following files in the build folder of the downloaded YUI distribution on your hard disk, and copy them to your web folder (bearing in mind that assets is a folder, not a file):
<html><head><title>YUI Calendar</title> <link rel="stylesheet" type="text/css" href="fonts-min.css" /> <link rel="stylesheet" type="text/css" href="assets/skins/sam/calendar.css" /> <script src="yahoo-dom-event.js"></script> ...