YUI recommends YUI 3.

YUI 2 has been deprecated since 2011. This site acts as an archive for files and documentation.

Combobox, with CSS for Multiple Stacked Instances

This "combo box" AutoComplete implementation allows the user to pick an item from a set list or enter a custom value directly into the input field. Please note the following custom CSS:

Implementers who are working with data from third-party sources, user input data, or otherwise untrustworthy sources should be sure to read the Security Considerations section of the AutoComplete user guide.