| <!DOCTYPE html> |
| <head> |
| <title>Deferred images with loading='lazy' use the original |
| base URL specified at parse-time</title> |
| <link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="../resources/common.js"></script> |
| <base href='/html/semantics/embedded-content/the-img-element/resources/'> |
| </head> |
| |
| <script> |
| const below_viewport_img = new ElementLoadPromise("below-viewport"); |
| |
| let has_window_loaded = false; |
| |
| async_test(t => { |
| // At this point, the below-viewport image's request has been set-up, and |
| // its URL is the URL that was parsed relative to the document's base URL |
| // at this time. Any changes to the document's base URL from this point |
| // forward should not impact the image when we scroll it in-view. This is |
| // because the next step in the #updating-the-img-data algorithm is to to |
| // fetch the request that has already been set up. Now we'll change the |
| // document's base URL, and scroll the image in-view. |
| window.addEventListener("load", t.step_func(() => { |
| const base = document.querySelector('base'); |
| base.href = '/invalid-url-where-no-subresources-exist/'; |
| has_window_loaded = true; |
| below_viewport_img.element().scrollIntoView(); |
| })); |
| |
| below_viewport_img.promise.then(t.step_func_done(() => { |
| assert_true(has_window_loaded, |
| "Below-viewport loading=lazy images do not block the " + |
| "window load event"); |
| })); |
| |
| below_viewport_img.promise.catch( |
| t.unreached_func("The image request should not load relative to the " + |
| "current (incorrect) base URL.") |
| ); |
| }, "When a loading=lazy image is loaded, it loads relative to the " + |
| "document's base URL computed at parse-time."); |
| </script> |
| |
| <body> |
| <div style="height:1000vh"></div> |
| <img id="below-viewport" src="image.png" loading="lazy" |
| onload="below_viewport_img.resolve()" |
| onerror="below_viewport_img.reject()"> |
| </body> |
