| <!DOCTYPE html> |
| <script src="../resources/js-test.js"></script> |
| <script src="../resources/gc.js"></script> |
| <div style="width:100%; height:700px;"></div> |
| <div id="target" style="background-color: green; width:100px; height:100px"></div> |
| <div style="width:100%; height:700px;"></div> |
| |
| <script> |
| jsTestIsAsync = true; |
| description("IntersectionObserver continues to produce notifications when it has no javascript references."); |
| var target = document.getElementById("target"); |
| var entries = []; |
| new IntersectionObserver(function(changes) { |
| entries.push(...changes); |
| }).observe(target); |
| gc(); |
| document.scrollingElement.scrollTop = 300; |
| // See README for explanation of double RAF. |
| requestAnimationFrame(() => { requestAnimationFrame(() => { |
| // In other IntersectionObserver tests, observer.takeRecords() is used to ensure that |
| // all pending notifications are taken. Because this test specifically tests the |
| // case where the observer object has no js references, it can't use takeRecords(). |
| // However, the IntersectionObserver spec mandates that all notifications must be |
| // sent within 100ms of being generated, so this timeout effectively tests conformance |
| // with that requirement. |
| setTimeout(() => { |
| shouldBeEqualToNumber("entries.length", 1); |
| finishJSTest(); |
| }, 100) |
| }) }); |
| </script> |
