In the following picture, I have mocked up a CSS active menu styling I would like to find examples of, and hopefully replicate.

![Triangle active menu](https://i.stack.imgur.com/WBCFt.png)

You will notice there is a triangle highlighting the active menu, and it can appear bold too.

Question 1. What is this "active menu triangle style" actually called? So I can find CSS examples of it.

Question 2. Where can I find examples of this?