TinyMCE's functionality can be extended with so-called Plugins. Here you can find an alphabetical list of all available plugins in the standard TinyMCE package.
To use a plugin, you need to use the advanced theme and add the plugin name in the "plugins" comma separated line. You also need to add the button to the interface. Read more about the advanced plugin to configure this.
Please notice that the plugins can require some configuration. Click on the plugin link to read more about that plugin.
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