The Autocomplete widgets provides suggestions while you type into the field. Here the suggestions are tags for programming languages, give "ja" (for Java or Javascr ipt) a try.

插件界面提供抽象为低级互动与高级动画，效果和高水平，支持主题工具，建立在顶部的类库，你可以用来建立高度互动的网页应用程序。-jQuery UI provides abstractions for low-level interaction and animation, advanced effects and high-level, themeable widgets, built on top of the jQuery Javasc