| <!DOCTYPE html> |
| <head> |
| <title>Multiple queued lazy load navigations do not crash the page</title> |
| <link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org"> |
| <link rel="help" href="https://html.spec.whatwg.org/multipage/urls-and-fetching.html#lazy-loading-attributes"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| |
| <script> |
| const t = async_test('Multiple queued lazy load navigations do not crash ' + |
| 'the page'); |
| |
| let has_below_viewport_loaded = false; |
| |
| window.addEventListener("load", t.step_func(() => { |
| assert_false(has_below_viewport_loaded, |
| "The below_viewport element should not have loaded before " + |
| "window.load()."); |
| |
| // Queue another lazy load navigation on the iframe. This should not result |
| // in multiple internal intersection observers being created for the iframe |
| // element, but instead should result in only one intersection observer |
| // associated with the iframe element, and the resulting navigation should |
| // be for the latest `src` attribute mutation. |
| const target = document.querySelector('#below_viewport'); |
| target.src = 'resources/subframe.html?new-src'; |
| target.scrollIntoView(); |
| })); |
| |
| const below_viewport_iframe_onload = t.step_func_done(() => { |
| const target = document.querySelector('#below_viewport'); |
| // We check both of these to ensure that the `src` attribute and actual |
| // navigated resource do not get out-of-sync when navigating to lazy loaded |
| // resources. |
| assert_true( |
| target.src.includes('new-src'), |
| "The iframe's src should be updated to reflect the latest `src` " + |
| "mutation"); |
| assert_true( |
| target.contentDocument.location.href.includes('new-src'), |
| 'The iframe should be navigated to the resource provided by the latest ' + |
| '`src` mutation'); |
| }); |
| </script> |
| |
| <body> |
| <div style="height:3000vh;"></div> |
| <iframe id="below_viewport" src="resources/subframe.html?old-src" |
| loading="lazy" width="200px" height="100px" |
| onload="below_viewport_iframe_onload();"></iframe> |
| </body> |
