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Simple Code Block Highlighter enhances the default WordPress code and preformatted blocks. It can show line numbers, add a copy-to-clipboard button, switch between light and dark display themes, and automatically color code blocks with bundled Highlight.js syntax highlighting.
The plugin uses the WordPress Settings API, validates and sanitizes saved options, escapes admin output, and avoids inline JavaScript-generated HTML for line numbers. Syntax highlighting is served from the plugin files and does not load a third-party CDN on visitor pages.
For setup help, read the <a href="https://www.techgrapple.com/simple-code-block-highlighter-free-plugin-for-wordpress/" rel="nofollow ugc">Simple Code Block Highlighter guide</a>.
<h3>Third-party Libraries</h3>
This plugin bundles Highlight.js 11.11.1 for syntax highlighting.
Highlight.js 
Source: <a href="https://github.com/highlightjs/highlight.js" rel="nofollow ugc">Highlight.js on GitHub</a> 
License: BSD 3-Clause 
License file included at: assets/vendor/highlightjs/LICENSE

Simple Code Block Highlighter

Enhances WordPress code blocks with line numbers, copy functionality, automatic syntax highlighting, and light or dark themes.

Simple Code Block Highlighter vs Copy Anything to Clipboard for WordPress – Copy Button, Copy Text & Copy Code