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onmessage = function (e) {
if (!e.source) {
dump("ERROR: message doesn't have a source.");
}
if (!(e instanceof ExtendableMessageEvent)) {
e.source.postMessage("ERROR. event is not an extendable message event.");
}
// The client should be a window client
if (e.source instanceof WindowClient) {
e.source.postMessage(e.data);
} else {
e.source.postMessage("ERROR. source is not a window client.");
}
};