A mouseup is just the second part of a click. It's useful for detecting when a user falls asleep mid-click and releases it later.
(Hint: click and drag into another element and then release. Don't drag any THING, though, because that's a different event.)
<script> export default { methods: { onMouseUpOutside(e, el) { console.log("onMouseUpOutside"); console.log("Event:", e); console.log("Element mouse released on:", e.target); console.log("Element that was scrutinizing the situation for this very thing:", el); } } } </script>