| <!DOCTYPE html> |
| <script src="../resources/testharness.js"></script> |
| <script src="../resources/testharnessreport.js"></script> |
| <body> |
| <script> |
| async_test(t => { |
| // Test that ResizeObserver and its callback function do not cause any crash. |
| // This test is considered as successful as long as the test doesn't crash. |
| // See also https://crbug.com/792604 and https://crbug.com/809784 . |
| |
| let target_element = document.createElement('div'); |
| document.body.appendChild(target_element); |
| |
| // Run a bunch of ResizeObservers to expect high probability to cause a crash. |
| const num_of_observers = 100; |
| resize_observers = new Array(num_of_observers); |
| for (let i = 0; i < num_of_observers; ++i) { |
| resize_observers[i] = new ResizeObserver(entries => { |
| for (let i = 0; i < num_of_observers; ++i) { |
| if (resize_observers[i] === null) continue; |
| // An Element retains the callback functions that are observing the |
| // change on size of the Element. Make the Element not retain the |
| // callback functions. |
| resize_observers[i].unobserve(target_element); |
| // Make the test itself not retain the callback functions. |
| resize_observers[i] = null; |
| } |
| |
| // Try to collect the callback functions. |
| gc(); |
| |
| on_observed(); |
| }); |
| |
| resize_observers[i].observe(target_element); |
| } |
| |
| let observation_count = 0; |
| // Wait for the test to finish resize observations for a while. |
| let test_done_timer = null; |
| const test_done_timer_delay = 100; |
| const on_observed = () => { |
| ++observation_count; |
| |
| if (test_done_timer !== null) |
| return; |
| |
| test_done_timer = setTimeout(() => { |
| // https://wicg.github.io/ResizeObserver/#broadcast-resize-notifications-h |
| // 3.3.4. Broadcast active observations is a bit ambiguous about whether |
| // |unobserve| in the callback functions takes effect immediately or |
| // delayed. Assuming that it must take effect immediately, the expected |
| // number of observations is 1. |
| assert_equals(observation_count, 1); |
| |
| target_element.remove(); |
| t.done(); |
| }, test_done_timer_delay); |
| }; |
| |
| target_element.style.width = "42px"; |
| }, "Tries to break wrapper-tracing and to make it crash."); |
| </script> |
| </body> |
