iframe-loading-lazy-base-url.html (1735B)
1 <!DOCTYPE html> 2 <head> 3 <title>Deferred iframes with loading='lazy' use the original 4 base URL specified at parse-time</title> 5 <link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com"> 6 <script src="/resources/testharness.js"></script> 7 <script src="/resources/testharnessreport.js"></script> 8 <script src="../resources/common.js"></script> 9 <base href='/html/semantics/embedded-content/the-iframe-element/resources/'> 10 </head> 11 12 <script> 13 const below_viewport_iframe = new ElementLoadPromise("below-viewport"); 14 15 let has_window_loaded = false; 16 17 async_test(t => { 18 // Change the base URL and scroll down to load the deferred iframe. 19 window.addEventListener("load", t.step_func(() => { 20 const base = document.querySelector('base'); 21 base.href = '/invalid-url-where-no-subresources-exist/'; 22 has_window_loaded = true; 23 below_viewport_iframe.element().scrollIntoView(); 24 })); 25 26 below_viewport_iframe.promise.then( 27 t.step_func_done(() => { 28 assert_true(has_window_loaded, 29 "Below-viewport loading=lazy iframes do not block the " + 30 "window load event"); 31 assert_true(below_viewport_iframe.element().contentDocument.body. 32 innerHTML.includes("<p>Subframe</p>"), 33 "The loading=lazy iframe's content is accessible upon loading"); 34 })); 35 36 }, "When a loading=lazy iframe is loaded, it loads relative to the " + 37 "document's base URL computed at parse-time."); 38 </script> 39 40 <body> 41 <div style="height:1000vh"></div> 42 <iframe id="below-viewport" src="subframe.html" loading="lazy" 43 width="200px" height="100px" onload="below_viewport_iframe.resolve()"> 44 </iframe> 45 </body>