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<!doctype html>
<script>
let current = new URL(window.location.href);
let navigateTo = current.searchParams.get("to");
let channelName = current.searchParams.get("channelName");
let postMessageTo = current.searchParams.get("postMessageTo");
current.search = "";
if (navigateTo) {
let next = new URL(navigateTo, current);
window.addEventListener("load", () => {
window.location.href = next.href;
});
}
let target = undefined;
if (channelName) {
target = new BroadcastChannel(channelName);
} else if (postMessageTo) {
target = eval(postMessageTo);
}
if (target) {
// Broadcast only once the DOM is loaded, so that the caller can
// access reliably this document's body.
window.addEventListener("DOMContentLoaded", () =>
target.postMessage("loaded", "*"));
// The page can also be restored from the back-forward cache:
window.addEventListener('pageshow', function(event) {
if (event.persisted)
target.postMessage("loaded", "*");
});
}
</script>