← You're Blocking Scroll by Default. `passive: true` Fixes It.Quiz
Passive event listeners
Seven questions on what { passive: true } actually promises the browser, which events it matters for, and what happens when you break that promise.
questions7
pass mark70%
resultsat the end
No account needed. Answer all 7 questions, then see your score with every answer explained and a reference to the spec or MDN — pass and you can claim a certificate.