Hands-on practice for this lecture. Work through the exercises and quizzes to reinforce what you've learned.
Exercise 1 of 1
Measure a DOM element in useEffect vs useLayoutEffect. See which phase gives you accurate dimensions before the browser paints.
Measured element
Phase log
⌠Measuring in useEffect
Fires after browser paint. A tooltip or overlay repositioned here causes a visible flash — old position → new position.
Recent measurements
Click the button…