| <!DOCTYPE html> |
| <body> |
| <script> |
| function nextEvent(target, type) { |
| return new Promise((resolve, reject) => target.addEventListener(type, e => resolve(e), {once: true})); |
| } |
| |
| onload = async function() { |
| const portal = document.createElement('portal'); |
| portal.src = new URL('simple-portal.html', location.href); |
| document.body.appendChild(portal); |
| await nextEvent(portal, 'load'); |
| |
| let firedEvents = []; |
| for (let type of ['pagehide', 'unload']) { |
| nextEvent(window, type).then(() => { |
| firedEvents.push(type); |
| localStorage.setItem('predecessor-fires-unload-events', firedEvents.join(' ')); |
| }); |
| } |
| |
| portal.activate(); |
| }; |
| </script> |
| </body> |
