| <!DOCTYPE html> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="utils.js"></script> |
| <script src="deferred-promise-utils.js"></script> |
| <script> |
| const params = new URLSearchParams(location.search); |
| |
| // The main test page (visibility-state.html) loads the initiator page, |
| // then the initiator page will prerender itself with the `prerendering` |
| // parameter. |
| const isPrerendering = params.has('prerendering'); |
| |
| if (!isPrerendering) { |
| loadInitiatorPage(); |
| } else { |
| const prerenderEventCollector = new PrerenderEventCollector(); |
| const promise = new Promise((resolve) => { |
| prerenderEventCollector.addEvent( |
| 'Initial visibilityState: ' + document.visibilityState); |
| |
| document.addEventListener('prerenderingchange', () => { |
| prerenderEventCollector.addEvent( |
| 'visibilityState after prerenderingchange: ' + |
| document.visibilityState); |
| resolve(); |
| }); |
| }); |
| prerenderEventCollector.start(promise, 'visibilityState check'); |
| } |
| |
| </script> |
