Practice listening for and handling JavaScript DOM Events
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# Stoplight Exercise
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As always, fork and clone this repo. Submit a Pull Request when you are done.
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## Stoplight
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Wire up the buttons to the left of the stoplight to toggle the on/off state of each bulb.
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## Hints
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* Retrieve a DOMElement with [`document.querySelector`](https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector)
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* Attach listeners with [`addEventListener`](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener)
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* Set the color of a bulb with [`background-color`](https://developer.mozilla.org/en-US/docs/Web/CSS/background-color)
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