Request: add another example, but showing how to use a gem

Right now we have this:

Quick Example: Ruby on Web browser
Create and save index.html page with the following contents:

And this works, I tested it.

Could a second example be added, but one that also shows how to embed a simple gem?

May be enough for a "hello world", or any other simple gem for that matter.

I would like to see the syntax, for making use of gems as add-on.

从现有的“Quick Example: Ruby on Web browser”及其 index.html 示例开始。添加第二个示例，展示在浏览器中使用简单 Ruby gem 的语法，并使该示例像现有示例一样可以运行。该 issue 没有指定文档文件、gem 或 test，因此必须先找到它们。