image-loading-eager.html (1906B)
1 <!DOCTYPE html> 2 <head> 3 <title>Images with loading='eager' load immediately regardless of their 4 position with respect to the viewport</title> 5 <link rel="author" title="Scott Little" href="mailto:sclittle@chromium.org"> 6 <link rel="help" href="https://github.com/scott-little/lazyload"> 7 <script src="/resources/testharness.js"></script> 8 <script src="/resources/testharnessreport.js"></script> 9 </head> 10 11 <script> 12 const t = async_test("Test that images with loading='eager' load " + 13 "immediately regardless of their position with " + 14 "respect to the viewport."); 15 16 let has_in_viewport_loaded = false; 17 const in_viewport_img_onload = t.step_func(() => { 18 assert_false(has_in_viewport_loaded, 19 "The in_viewport element should load only once."); 20 has_in_viewport_loaded = true; 21 }); 22 23 let has_below_viewport_loaded = false; 24 const below_viewport_img_onload = t.step_func(() => { 25 assert_false(has_below_viewport_loaded, 26 "The below_viewport element should load only once."); 27 has_below_viewport_loaded = true; 28 }); 29 30 window.addEventListener("load", t.step_func_done(() => { 31 assert_true(has_in_viewport_loaded, 32 "The in_viewport element should have loaded before window.load()."); 33 assert_true(has_below_viewport_loaded, 34 "The below_viewport element should have loaded before window.load()."); 35 })); 36 37 </script> 38 39 <body> 40 <img id="in_viewport" src="resources/image.png?in-viewport" loading="eager" onload="in_viewport_img_onload();"> 41 <div style="height:10000px;"></div> 42 <!-- The below_viewport element loads very slowly in order to ensure that the 43 window load event is blocked on it. --> 44 <img id="below_viewport" 45 src="resources/image.png?below-viewport&pipe=trickle(d2)" 46 loading="eager" onload="below_viewport_img_onload();"> 47 </body>