Table of Contents, + header anchor links
This may be a theme-by-theme feature, but a table of contents is sometimes handy for users wanting to get an overview of longer posts or pages. It could automatically capture headings → turn them into anchor links which are subsequently inside a sticky list on the right or left or top of the page. On mobile, sometimes this is added to a small, collapsed menu.A separate, but related feature is to make headings clickable anchor links so that users who want to share the URL to a specific heading can just click the heading + copy the URL (or right-click a heading and copy that URL). An example of both features: https://developer.mozilla.org/en-US/docs/Web/CSSIf you click any of the H2 headings, such as Reference, they'll change the site URL to that (e.g,. an ID is set and the text is a link to its own ID). Also, on the right side, we have a sticky table of contents with large clickable headings + highlighting when in view.
