Purab

<p>Short Syntax Highlighter allows you to easily post syntax-highlighted code to your site without losing it’s formatting or making any manual changes.<br />
Without adding any JS or css file in your theme.</p>
<p>This plugin will help you to highlight the code systax.</p>
<p><a href="http://wpapi.com/how-to-use-short-syntax-highlighter-shortcode-wordpress-plugin/" rel="nofollow ugc">Step by step installation instructions >></a></p>
<p>Demo URL:<br />
http://wpapi.com</p>
<p><a href="http://wpapi.com/contact/" rel="nofollow ugc">Click here for customer support >></a></p>
<p>Sample of using the plugin Can be found on following URL:</p>
<p><a href="http://wpapi.com/how-to-use-short-syntax-highlighter-shortcode-wordpress-plugin/" rel="nofollow ugc">Sample of using the plugin instructions >></a></p>
<p>Tested upto 4.0</p>
<h4>Functionality</h4>
<p>This plugin will help you to highlight the code systax.</p>
<h3>Help</h3>
<p><a href="http://wpapi.com/contact/" rel="nofollow ugc">Click here for customer support >></a></p>
<p>For help and support please contact us at contact [at] digcms.com</p>


Short Syntax Highlighter Shortcode

Short Syntax Highlighter allows you to easily post syntax-highlighted code to your site without losing it's formatting or making any manual chang …

Aki Hamano

<p>RichText Extension adds useful decorating features to gutenberg rich text editor.</p>
<h4>Highlighter</h4>
<p>Draw a marker on the inline text.<br />
You can set the color, thickness, and opacity of the marker to you can create various marker styles.<br />
Up to four types of settings can be made.</p>
<h4>Font size</h4>
<p>Change inline text size.<br />
The size is specified as a percentage of the base font size, and up to four types of settings can be made.</p>
<h4>Underline</h4>
<p>Create underline.<br />
<strong>Note: The underline specifications have changed from version 2.0.0. Try clearing the format if existing underlines do not work.</strong></p>
<h4>Clear format</h4>
<p>Removes all formatting.</p>


RichText Extension

This is by far the best approach I've seen so far on really adding something usable to the WP Gutenberg Block Editor

well done ...

Adds useful decoration features to the Gutenberg RichText editor toolbar.

Short Syntax Highlighter Shortcode vs RichText Extension