Output <null>

Question

Why is my output <null> and not <canvas>
https://code.sololearn.com/W2Gc7h5skbHV/?ref=app

Answer 1

Because canvas do nothing to the console?

Answer 2

Julien Quentin thank you☺️ but, now it gives a script error😬
https://code.sololearn.com/W2Gc7h5skbHV/?ref=app

Answer 3

Théo you should learn maths and ett lessons