The plugin will provide a collapsible HTML <details> block with a <summary> element that will be shown when the element is collapsed. Inside the details you can put as many paragraphs or code blocks as you want.
Requirements
- PHP 5.6 or greater (recommended: PHP 7 or greater)
- WordPress 5.0 or above (because of the Gutenberg editor)
This plugin is available for download for your site.