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<!DOCTYPE html>
<style>
#spacer {
width: 200%;
height: 200%;
}
</style>
<body>
<script>
window.addEventListener("message", onMessageReceived);
function test(api, args) {
let did_throw = false;
try {
document[api](args);
} catch(e) {
did_throw = true;
}
return did_throw;
}
function onMessageReceived(e) {
let msg = e.data;
msg.did_throw_exception = test(msg.api, msg.args);
if (msg.query) {
let el = document.querySelector(msg.query);
msg.value = el ? el.innerHTML : false;
}
ackMessage(msg, e.source);
}
function ackMessage(msg, source) {
source.postMessage(msg, "*");
}
</script>
</body>
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