How to get the outline of a post?


like above, I want build it for my theme

As far as I understand your requirement, you want to show a “table of content” above your each post.
You can do this by using JavaScript.
The concept is, loop through your post content and get all the headings. Generate a ordered or un-ordered list of those headings and inject that above the content.

There is a good article on css-tricks you can check that. Automatic Table of Contents | CSS-Tricks - CSS-Tricks

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Thank you very much !