image-full-viewport.html (1792B)
1 <!DOCTYPE HTML> 2 <meta charset=utf-8> 3 <title>Largest Contentful Paint: size when image overflows</title> 4 <!-- In this test, an image with an intrinsic size of 100 x 50 is added, but 5 scaled up in order to overflow the viewport. It should not be reported. --> 6 <body> 7 <style> 8 body { 9 margin: 0px; 10 } 11 </style> 12 <script src="/resources/testharness.js"></script> 13 <script src="/resources/testharnessreport.js"></script> 14 <script src="resources/largest-contentful-paint-helpers.js"></script> 15 <script> 16 const viewportWidth = document.documentElement.clientWidth; 17 const viewportHeight = document.documentElement.clientHeight; 18 setup({"hide_test_state": true}); 19 async_test(function (t) { 20 assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); 21 const beforeLoad = performance.now(); 22 new PerformanceObserver( 23 t.step_func_done(function(entryList) { 24 assert_equals(entryList.getEntries().length, 1, 'Should have received only one entry!'); 25 const entry = entryList.getEntries()[0]; 26 if (entry.url) 27 assert_unreached('Should not have received an image entry!'); 28 }) 29 ).observe({type: 'largest-contentful-paint', buffered: true}); 30 // Add an image, setting width and height equal to viewport. 31 img = document.createElement('img'); 32 img.src = '/images/lcp-100x50.png'; 33 img.id = 'image_id'; 34 img.width = viewportWidth * 2; 35 img.height = viewportHeight * 2; 36 img.onload = () => { 37 const p = document.createElement('p'); 38 p.innerHTML = 'a'; 39 p.style = 'position: absolute; top: 10px; left: 10px;'; 40 document.body.appendChild(p); 41 } 42 document.body.appendChild(img); 43 }, 'The intersectionRect of an img element overflowing is computed correctly'); 44 </script> 45 </body>