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<!DOCTYPE html>
<a target="_blank" id="a_click_target">Click me</a>
<map id="map">
<area coords="0,0,50,50" target="_blank">
</map>
<img src="/images/blue.png" usemap="#map" style="width: 50px; height: 50px" id="area_click_target">
<script>
let channel = new BroadcastChannel(window.location.search.substring(1));
channel.addEventListener("message", (e) => {
if (e.data == "close") {
window.close();
}
});
channel.postMessage("ready");
</script>