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// Portal tests often need to create portals in a context other than the one
// in which the tests are running. This is because the host context may be
// discarded during the course of the test.
// Opens a blank page for use as a portal host.
// Tests cannot simply use window.open() without a URL as about:blank may not
// host a portal.
async function openBlankPortalHost() {
let hostWindow = window.open('/portals/resources/blank-host.html');
await new Promise((resolve) => {
hostWindow.addEventListener('load', resolve, {once: true});
});
return hostWindow;
}
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