Reaction Tester

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Hint: If you're having trouble, look at exercise set 5.

Hints

For calculating the reaction time, do NOT set an interval. Instead, record when the page changes color, and record when the user clicks the button. Then do some math to calculate the reaction time.
For recording times, store the current time, expressed as the number of milliseconds since midnight January 1, 1970:
yourVariable = Date.now()
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