lcp-sw.https.html (400B)
1 <!DOCTYPE HTML> 2 <meta charset=utf-8> 3 4 <body> 5 <script> 6 new PerformanceObserver(entries => { 7 window.parent.postMessage(entries.getEntries()[0].toJSON()); 8 }).observe({ entryTypes: ["largest-contentful-paint"] }); 9 10 const image = document.createElement("img"); 11 image.src = "/images/green.svg"; 12 image.id = "theImage"; 13 document.body.appendChild(image); 14 </script> 15 </body>