<head>
<style type="text/css">
link {
    display: block;
    width: 100px;
    height: 100px;
    border: 1px solid red;
}
</style>
</head>
<div></div>
<link id="target" href="html-link-element-activation-behavior-target.html">
<script>
function mouseClick() {
    if (window.eventSender) {
        eventSender.mouseMoveTo(50, 140);
        eventSender.mouseDown();
        eventSender.mouseUp();
    }
    setTimeout(() => {
        window.parent.postMessage("test:ok", "*");
    }, 100);
}
window.addEventListener("message", mouseClick);
</script>