What means [Object Window] in output of code?

Question

I'm new in programing and in this app. When running some kind of mathematical code the output is "[Object Window]". What does it mean? Thank u
https://code.sololearn.com/WRCIvU0FhkwX/?ref=app
https://code.sololearn.com/WRCIvU0FhkwX/?ref=app

Answer 1

ODLNT , Thank you very much for help! I will try to understand 😊

Answer 2

You are so but beautiful

Answer 3

document.write makes this in output. I've added code