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function send_ping() {
window.dispatchEvent(new Event("ping"));
}
send_ping(); // ping (=1)
window.addEventListener("load", function () {
send_ping(); // ping (=2)
// Append a script which should call |foo|, before the encoding of this script
// bytecode.
var script = document.createElement("script");
script.type = "text/javascript";
script.innerText = "send_ping();"; // ping (=3)
document.head.appendChild(script);
});