How To Add Your Own Custom Buttons In WordPress Post Editor’s HTML Toolbar ?
You can add your own buttons to WordPress post editor’s HTML mode toolbar.
Post Editor Buttons Fork
Post Editor Buttons Fork plugin allows you to add your own buttons in Post’s HTML editor toolbar, this way you make things easy by using few more buttons for allowing custom styling to posts. Simply install and activate this plugin then visit your Dashboard -> Settings -> Post Editor Buttons and start adding more buttons.