Theme Tester tool
From MoodleDocs
A Moodle Theme Testing tool, with a focus on Bootstrap 4 based themes. It fills a similar role to the core Element Library
This tool provides pages containing various elements of Moodle generated by calling renderers and mustache templates, and the Bootstrap 4 framework docs. These are displayed live within Moodle, using your current theme CSS to allow for quickly identifying problems when developing or testing themes by displaying all kinds of buttons and form elements together in one easily accessed place.
