| <!DOCTYPE html> | |
| <script> | |
| function createIntersectionObserver(FunctionConstructor = Function) { | |
| const intersectionObserver = new parent.IntersectionObserver(new FunctionConstructor(` | |
| if (this.isInitialEntry) { | |
| this.isInitialEntry = false; | |
| return; | |
| } | |
| this.callbackInvocations++; | |
| `)); | |
| intersectionObserver.isInitialEntry = true; | |
| intersectionObserver.callbackInvocations = 0; | |
| intersectionObserver.observe(parent.intersectionObserverTestRoot, { threshold: 1 }); | |
| return intersectionObserver; | |
| } | |
| </script> |