file_getCoalescedEvents_retained_event_leak.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

</head>

<body>

<!-- DO NOT PUT any text before the test target to avoid fractional coordinates! -->

<div id="target" style="width: 100px; height: 50px; background: green"></div>

<script>

  // Retain every "pointermove" event after asking for its coalesced events,

  // like pointer-sampling scripts on real pages do.

  window.events = [];

  window.coalescedEventCount = 0;

  document.addEventListener("pointermove", event => {

    window.coalescedEventCount = event.getCoalescedEvents().length;

    window.events.push(event);

});

</script>

</body>

</html>