How to automatically hide long posts under the spoiler?

Question

WordPress

This means that the entry appears on the page as a whole, not as a quote, but most of the content will be hidden by the "expand" button, as in many sites. I googled for a long time, but I didn’t find anything about “automatically”.

Answer 1

There is no magic button, you need to write in js, or look for ready-made solutions. For example: ReadMore.js (exemple)
Well, or still display a part of the text, and on a click on the button pull it out with ajax.

Answer 2

This is implemented at the level of your theme. There are functions that display both a quote and full content, and depending on the site settings. Hiding under the spoiler is easy - use <details>.