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<!doctype html>
<button>Gain user activation</button>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script>
test_driver.set_test_context(top.opener);
window.onload = async function () {
try {
top.location = "navigation-changed-iframe.html";
return;
} catch (e) {
top.opener.postMessage("ERROR", "*");
}
const button = document.querySelector("button");
await test_driver.click(button);
try {
top.location = "navigation-changed-iframe.html";
} catch (e) {
top.opener.postMessage("ERROR", "*");
}
};
</script>