| <!DOCTYPE html> |
| <head> |
| <title>Images with loading='lazy' in picture elements load when near the viewport</title> |
| <link rel="author" title="Raj T" href="mailto:rajendrant@chromium.org"> |
| <link rel="help" href="https://github.com/scott-little/lazyload"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="../resources/common.js"></script> |
| </head> |
| |
| <script> |
| const in_viewport_img = new ElementLoadPromise("in_viewport_img"); |
| const lazy_attribute_img = new ElementLoadPromise("lazy_attribute_img"); |
| const eager_attribute_img = new ElementLoadPromise("eager_attribute_img"); |
| |
| const document_load_promise = new Promise(resolve => { |
| window.addEventListener("load", resolve); |
| }); |
| |
| async_test(function(t) { |
| document_load_promise.then(t.step_func_done(function() { |
| assert_false(lazy_attribute_img.element().complete); |
| lazy_attribute_img.element().scrollIntoView(); |
| })); |
| }, "Test that the loading=lazy <picture> element below viewport was deferred, on document load."); |
| |
| async_test(function(t) { |
| in_viewport_img.promise.then(t.step_func_done()); |
| }, "Test that in viewport <picture> element was loaded"); |
| |
| async_test(function(t) { |
| eager_attribute_img.promise.then(t.step_func_done()); |
| }, "Test that eager <picture> element was loaded"); |
| |
| async_test(function(t) { |
| lazy_attribute_img.promise.then(t.step_func_done()); |
| }, "Test that deferred <picture> element was loaded-in as well, after scrolled down"); |
| |
| </script> |
| |
| <body> |
| <picture> |
| <source sizes='50vw' srcset='resources/image.png?in_viewport_img'> |
| <img id='in_viewport_img' src='img-not-loaded.png' loading="lazy" onload="in_viewport_img.resolve();"> |
| </picture> |
| <div style="height:10000px;"></div> |
| <picture> |
| <source sizes='50vw' srcset='resources/image.png?lazy_attribute_img'> |
| <img id='lazy_attribute_img' src='img-not-loaded.png' loading="lazy" onload="lazy_attribute_img.resolve();"> |
| </picture> |
| <picture> |
| <source sizes='50vw' srcset='resources/image.png?eager_attribute_img'> |
| <img id='eager_attribute_img' src='img-not-loaded.png' loading="eager" onload="eager_attribute_img.resolve();"> |
| </picture> |
| |
| <!-- |
| This async script loads very slowly in order to ensure that, if the |
| below_viewport image has started loading, it has a chance to finish |
| loading before window.load() happens, so that the test will dependably fail |
| in that case instead of potentially passing depending on how long different |
| resource fetches take. |
| --> |
| <script async src="/common/slow.py"></script> |
| </body> |
