Exercise Solutions: The DOM and Events¶

When the Take off button is clicked, the text The shuttle is on the ground changes to Houston, we have liftoff!. The Take off button has an id="liftoffButton" attribute.
```
button.addEventListener('click', event => {
   paragraph.innerHTML = 'Houston! We have liftoff!';
});
```
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When the user's cursor leaves the Abort Mission button, the button's background returns to its original state (Hint: Setting the background color to the empty string, "", will force it to revert to the default browser styles.)
```
missionAbort.addEventListener("mouseout", function( event ) {
   event.target.style.backgroundColor = "";
});
```
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