Raw shortcode will allow you to insert unformatted code to any page inside visual editor. Raw shortcode prevents WordPress autoformatting, for example automatic adding of br or p tags. You can insert raw shortcode by clicking on green button in visual editor:
There are no options for raw shortcode:
By clicking on Insert shortcode button you’ll get the like like:
[raw raw=""]Test[/raw]
The code above will generate the following:
Test