| <!DOCTYPE html> |
| <head> |
| <title>Below-viewport iframes with loading='lazy' load when set to |
| loading='eager' or the `loading` attribute is removed</title> |
| <link rel="author" title="Dom Farolino" href="mailto:domfarolino@gmail.com"> |
| <link rel="help" href="https://github.com/whatwg/html/pull/5579"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| |
| <script> |
| const t = async_test("Below-viewport iframes with loading='lazy' load when " + |
| "set to loading='eager' or the `loading` attribute is " + |
| "removed"); |
| |
| const iframe_1_onload = t.unreached_func("#iframe_1 should not load before " + |
| "the window load event"); |
| const iframe_2_onload = t.unreached_func("#iframe_2 should not load before " + |
| "the window load event"); |
| |
| window.addEventListener("load", t.step_func(() => { |
| const iframe_1 = document.querySelector('#iframe_1'); |
| const iframe_2 = document.querySelector('#iframe_2'); |
| |
| const iframe_1_promise = new Promise((resolve, reject) => { |
| iframe_1.onerror = reject; |
| iframe_1.onload = resolve; |
| }); |
| |
| const iframe_2_promise = new Promise((resolve, reject) => { |
| iframe_2.onerror = reject; |
| iframe_2.onload = resolve; |
| }); |
| |
| Promise.all([iframe_1_promise, iframe_2_promise]) |
| .then(t.step_func_done()) |
| .catch(t.unreached_func("The iframes should load successfully")); |
| |
| // Kick off the requests. |
| iframe_1.loading = 'eager'; |
| iframe_2.removeAttribute('loading'); // unset the attribute, putting it in |
| // the default (eager) state. |
| })); |
| |
| </script> |
| |
| <body> |
| <div style="height:1000vh;"></div> |
| <iframe id="iframe_1" |
| src="resources/subframe.html?1" |
| loading="lazy" onload="iframe_1_onload();"></iframe> |
| <iframe id="iframe_2" |
| src="resources/subframe.html?2" |
| loading="lazy" onload="iframe_2_onload();"></iframe> |
| </body> |
