{ const rect = this.getBoundingClientRect(); const inView = ( rect.top = 0 && rect.left = 0 ); this.contentWindow.postMessage({ inView: inView }, '*'); }; window.addEventListener('scroll', isIframeInView); window.addEventListener('message', (event) => { if (event.data === 'checkInView') { isIframeInView(); } }); isIframeInView();" >