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The mousedown, mouseup and onclick events are all parts of a mouse-click. First when a mouse-button is clicked, the mousedown event is triggered, then, when the mouse-button is released, the mouseup event is triggered, finally, when the mouse-click is completed, the click event is triggered.
https://www.w3schools.com/js/js_htmldom_events.asp
// In HTML:
<element onmouseup="myScript"></element>
// In JavaScript:
object.onmouseup = function(){myScript};
// In JavaScript, using the addEventListener() method:
object.addEventListener("mouseup", myScript);
function mDown(obj)
{
obj.style.backgroundColor = "#1ec5e5";
obj.innerHTML = "Release Me";
}
function mUp(obj)
{
obj.style.backgroundColor = "#D94A38";
obj.innerHTML = "Thank You";
}