iframe-loading-eager.html (2088B)
1 <!DOCTYPE html> 2 <head> 3 <title>Iframes 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 iframes 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_iframe_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_iframe_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 " + 33 "window.load()."); 34 assert_true(has_below_viewport_loaded, 35 "The below_viewport element should have loaded before " + 36 "window.load()."); 37 })); 38 </script> 39 40 <body> 41 <iframe id="in_viewport" src="resources/subframe.html?in-viewport" 42 loading="eager" width="200px" height="100px" 43 onload="in_viewport_iframe_onload();"></iframe> 44 <div style="height:1000vh;"></div> 45 46 <!-- The below_viewport element loads very slowly in order to ensure that the 47 window load event is blocked on it. --> 48 <iframe id="below_viewport" 49 src="resources/subframe.html?below-viewport&pipe=trickle(d1)" 50 loading="eager" width="200px" height="100px" 51 onload="below_viewport_iframe_onload();"></iframe> 52 </body>