← Your `backdrop-filter` Is Working. Your Background Is Hiding It.Quiz
backdrop-filter: frosted glass, stacking contexts, and cost
Check what actually stuck: the transparency rule that makes or breaks the frosted-glass effect, the stacking context backdrop-filter quietly opens, and when the blur becomes a performance problem.
questions9
pass mark70%
resultsat the end
No account needed. Answer all 9 questions, then see your score with every answer explained and a reference to the spec or MDN — pass and you can claim a certificate.