David Klhufek

<p>This simple plugin adds useful buttons to the native WordPress HTML editor (Classic Editor).</p>
<p>Currently adds:<br />
h1, h2, h3, h4, h5, span, hr, nbsp, mox</p>
<p>The “mox” button adds a nice responsive CSS class which you can use to highlight pictures or other elements in your posts.</p>
<p><strong>Note:</strong> This plugin works only with the Classic Editor. It does not support the new Gutenberg (Block Editor).</p>
<h3>Compatibility</h3>
<ul>
<li>Requires the Classic Editor to be active.  </li>
<li>Designed specifically for the <strong>HTML mode</strong> of the editor.</li>
</ul>


Quicktags for WP

This simple plugin adds useful buttons to the native WordPress HTML editor.

lukasz.webmaster

<p>Syntax Highlighting in WordPress Plugins and Themes Editor.</p>
<h4>Features</h4>
<ul>
<li>Syntax highlighting in the Plugins and Themes Editor</li>
<li>AJAX save through CTRL+S</li>
<li>Ask whether to leave when there are unsaved changes</li>
<li>Change font size using Ctrl+=, Ctrl+-</li>
<li>Configurable through Settings page</li>
<li>Fullscreen mode (CTRL+Enter)</li>
<li>Shortcuts (keybindings: Vim, Emacs and <a href="https://github.com/ajaxorg/ace/wiki/Default-Keyboard-Shortcuts" title="Default shortcuts" rel="nofollow ugc">Default</a>)</li>
<li>Themes</li>
<li>Internationalized</li>
<li>Search and replace with regular expressions (CTRL+F, CTRL+H)</li>
<li>… and all other features that wonderful <a href="http://ace.c9.io/" rel="nofollow ugc">ACE Editor</a> provides</li>
</ul>


Syntax Highlight

Syntax Highlighting in WordPress Plugins and Themes Editor.

Quicktags for WP vs Syntax Highlight