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<p>English:</p>
<p>This plugin to select blocks of code takes advantage of JavaScript-library ‘google-code-prettify’. If it is for his work simply insert frame <pre> tag with class ‘prettyprint’.</p>
<p>*** Tip: In order to optimize the use of resources, try to use only one option – ‘Automatically replace the tags <pre> to <pre class=”prettyprint linenums”> before saving post.’</p>
<p>Russian:</p>
<p>Данный плагин для выделения блоков кода использует возможности JavaScript-библиотеки ‘google-code-prettify’. При это для его работы достаточно просто обрамлять вставки тегом <pre> с классом ‘prettyprint’.</p>
<p>***Совет: в целях оптимизации потребления ресурсов старайтесь использовать только 1 флажок – ‘Автоматически заменять <pre> на <pre class=”prettyprint linenums”> перед сохранением записи.’</p>


Code Prettify Syntax Highlighter

Highlighting the code in the post with JavaScript library «google-code-prettify».

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.

Code Prettify Syntax Highlighter vs RichText Extension