Intermediate
Seek an animation to a time
Write opacityAt(animation, ms): it jumps the animation to ms and returns the box's opacity as a number.
Leave the animation paused, so the test (not the clock) decides the time.
What Check tests
- At 0 ms the opacity is 0
- At 100 ms it is 0.5
- At 200 ms it is 1
- The animation is left paused, so the test decides the time
Stuck? One hint at a time
The solution unlocks after your first Check. Try first: that is where the learning happens.
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animations
0.00s0.10s0.20s0.30s0.40s0.50s0.60s0.70s0.80s0.90s
Nothing is moving yet. Hover, click or scroll the page: every animation it starts shows up here as a track.
frames
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