Style Sheets Required Element State

I was working through a problem and found a new option I hadn't seen before. Started looking in documentation and trying to find out how to use it. How do you use the Element State Required? and other items?

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Had you found this?

Oops, I don't think it's mentioned there.

Is it to do with a "required" element on a form. e.g., your phone number on a typical web page.

I don't think you can (currently) use required, because it requires your HTML to have a certain attribute, and I don't think any of our first-party components have any configuration to emit that attribute. However, in 8.3.0 we're introducing a new 'form' component where it will probably become more useful.