| <!DOCTYPE html> |
| <head> |
| <title>In-viewport loading=lazy iframes do not block the window load event</title> |
| <link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="../resources/common.js"></script> |
| </head> |
| |
| <body> |
| <!-- This image blocks the window load event for 1 second --> |
| <img src="/common/square.png?pipe=trickle(d1)"> |
| |
| <!-- These iframes must load because they intersect the viewport, but they must |
| not block the window load event, because they are loading=lazy --> |
| <iframe id="visible" loading="lazy" |
| src="resources/subframe.html?visible&pipe=trickle(d3)"></iframe> |
| <iframe id="visibility_hidden" style="visibility:hidden;" loading="lazy" |
| src="resources/subframe.html?visibility_hidden&pipe=trickle(d3)"></iframe> |
| </body> |
| |
| <script> |
| const visible_iframe = document.querySelector('#visible'); |
| const hidden_iframe = document.querySelector('#visibility_hidden'); |
| |
| const visible_iframe_t = |
| async_test('In-viewport loading=lazy iframe does not block the load event'); |
| |
| const hidden_iframe_t = |
| async_test('In-viewport loading=lazy visibility:hidden iframe does not ' + |
| 'block the load event'); |
| |
| let has_window_loaded = false; |
| window.addEventListener("load", () => { |
| has_window_loaded = true; |
| }); |
| |
| visible_iframe.onload = visible_iframe_t.step_func_done(() => { |
| assert_true(has_window_loaded, |
| "The visible iframe should not block the load event"); |
| }); |
| |
| hidden_iframe.onload = hidden_iframe_t.step_func_done(() => { |
| assert_true(has_window_loaded, |
| "The hidden iframe should not block the load event"); |
| }); |
| </script> |
