| <!DOCTYPE html> | |
| <script> | |
| function createResizeObserver(FunctionConstructor = Function) { | |
| const resizeObserver = new parent.ResizeObserver(new FunctionConstructor(` | |
| if (this.isInitialEntry) { | |
| this.isInitialEntry = false; | |
| return; | |
| } | |
| this.callbackInvocations++; | |
| `)); | |
| resizeObserver.isInitialEntry = true; | |
| resizeObserver.callbackInvocations = 0; | |
| resizeObserver.observe(parent.resizeObserverTestRoot); | |
| return resizeObserver; | |
| } | |
| </script> |