this-keyword: answer ambiguous. Can be undefined

[senocular]

Describe the bug

The result of the function in the question can be either window or undefined but the question only accepts window as a correct answer. Here's an example of the same code producing undefined: https://senocular.github.io/tests/function-context/

To Reproduce
Steps to reproduce the behavior:

1. Go to https://quiz.typeofnan.dev/this-keyword/
2. Click on undefined
3. Click on submit

Expected behavior
Answer is correct or question goes into more detail about the environment beyond just being in the browser that explicitly rules out situations where it may be undefined (i.e. strict mode).

Desktop (please complete the following information):

• OS: Mac
• Browser chrome
• Version 78