Is code syntax in posts created via REST API not highlighted?
Crayon Syntax Highlighter is one of the best code syntax highlighter plugins for WordPress and currently it does nto support REST API. This means that it does not highlight code in posts created via REST API, including posts created by Gutenberg.
This plugin adds support for it.
No more plain code!
此插件可供下载,可用于您的 WordPress 自托管安装。