您需要一个菜单选项，其中只有一个针对该用户名的选择器。
You need a menu option that has just one selector for the user name.
当一个用户代理不能解析某个选择器的时候，它必须忽略整个声明块。
When a user agent can't parse the selector, it must ignore the declaration block as well.
然后本文通过一个客户需求样例，演示了如何开发、部署及使用角色选择器小部件来满足用户需求。
Then, by using an example of one customer requirement, this article has shown how to develop, deploy, and use a role selector widget to meet the requirement.
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