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BOM and DOM - sound a little strange?
Do a little reading on these topics before attempting this test. They are essential to your understanding of some foundational concepts pertaining to JavaScript and how it works.
DOM: https://www.w3schools.com/js/js_htmldom.asp
BOM: https://www.w3schools.com/js/js_window.asp
For gifted and talented students or advanced users, this series of videos (crash course on BOM and DOM) is also very useful: https://youtu.be/0ik6X4DJKCc