| <!DOCTYPE html> |
| <head> |
| <title>Below viewport images with loading='lazy' and changed to |
| loading='eager' load and do not block the window load event</title> |
| <link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com"> |
| <link rel="help" href="https://github.com/scott-little/lazyload"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| |
| <script> |
| const t = async_test("Test that below viewport images with loading='lazy' " + |
| "and changed to loading='eager' load and do not block " + |
| "the window load event."); |
| |
| let has_below_viewport_loaded = false; |
| let has_window_loaded = false; |
| |
| window.addEventListener("load", t.step_func(function() { |
| assert_false(has_window_loaded, |
| "The window load event should only fire once."); |
| has_window_loaded = true; |
| })); |
| |
| const below_viewport_img_onload = t.step_func_done(function() { |
| assert_false(has_below_viewport_loaded, |
| "The in_viewport element should load only once."); |
| assert_true(has_window_loaded, |
| "The window load event should have fired before " + |
| "below_viewport loaded."); |
| has_below_viewport_loaded = true; |
| }); |
| </script> |
| |
| <body> |
| <div style="height:10000px;"></div> |
| <img id="below_viewport" src="resources/image.png?pipe=trickle(d2)" |
| loading="lazy" onload="below_viewport_img_onload();"> |
| <script> |
| assert_false(has_window_loaded, |
| "The window load event should not fire before " + |
| "changing below_viewport to loading='eager'."); |
| document.getElementById("below_viewport").loading = 'eager'; |
| </script> |
| </body> |
