The global event handler for the pointerleave event, which is delivered to a Node when the pointer (mouse cursor, fingertip, etc.) exits its hit test area (for example, if the cursor exits an Element or Window's content area). This event is part of the Pointer Events API.
EventTarget.onpointerleave = leaveHandler;
var leaveHandler = EventTarget.onpointerleave;
This example shows two ways to use onpointerleave to set an element's pointerleave event handler.
<html>
<script>
function leaveHandler(ev) {
}
function init() {
var el=document.getElementById("target1");
el.onpointerleave = leaveHandler;
}
</script>
<body onload="init();">
<div id="target1"> Touch me ... </div>
<div id="target2" onpointerleave="leaveHandler(event)"> Touch me ... </div>
</body>
</html>
See Using Pointer Events for additional details.