Metadata about Markdown

[W1ndys]

I have a question that may be presumptuous, what parameters can be used in the metadata of Markdown files?
Because I found the configuration parameter outline: deep in the file that comes with the framework, but I did not find the relevant configuration instructions in the material, so I wanted to find out if there is any

[alexvoss]

Not sure where you have found this. Some more context would help with answering this question.

[W1ndys]

Hi, this is my mistake, now I will describe the problem in detail
The general form of Markdown metadata is as follows

---
title: "xxxxx"
comments: true
description: "xxxxx"
icon: material/test-tube
status: test
template: test.html
date:
   created: 2021-05-08
   updated: 2022-05-09
outline: deep
---

What I want to know is, in addition to parameters such as title, data, icon, etc., are there any other parameter functions that can be supported? I want to find a document that lists all possible supported parameters.
Thank you very much for your reply
the best wishes

[alexvoss]

There is no comprehensive list of all the page header elements that exist because they are tied to the use of different features. The generic ones are listed on the Reference page. I am still not sure where outline: deep comes from, which is why I was asking where you have this metadata definition from. I could not find "outline:" in the documentation - perhaps this comes from a third party plugin? A duckduckgo search for mkdocs "outline:" deep only find this conversation, though.