| <!DOCTYPE html> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <body> |
| <script> |
| promise_test(async t => { |
| assert_implements("HTMLPortalElement" in self); |
| let portal = document.createElement('portal'); |
| portal.src = "resources/portal-close-window.html"; |
| let waitForMessage = new Promise((resolve, reject) => { |
| portal.onmessage = e => resolve(e.data); |
| document.body.appendChild(portal); |
| }); |
| document.body.appendChild(portal); |
| var message = await waitForMessage; |
| assert_equals(message, false); |
| t.add_cleanup(() => { document.body.removeChild(portal); }); |
| }, "A portal's window cannot be closed"); |
| </script> |
| </body> |
