| <!DOCTYPE html> |
| <head> |
| <title>Optimization of requestAnimationFrame callbacks that don't modify the DOM shouldn't break animations</title> |
| <link rel="author" title="Mukilan Thiyagarajan" href="mailto:[email protected]"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| <body> |
| <div id="target">0</div> |
| </body> |
| <script> |
| "use strict"; |
| async_test(function(test) { |
| let frame = 0; |
| const draw = (t) => { |
| frame += 1; |
| if (frame < 11) { |
| // Don't mutate the DOM for 10 frames to meet the threshold for Servo's |
| // spurious frame optimization to kick in. |
| requestAnimationFrame(draw); |
| } else if (frame == 11) { |
| // Don't schedule next rAF so the compositor's tick is disabled. |
| // This is specific to Servo as the spurious frame detection at the |
| // time of this test was broken. |
| test.step_timeout(() => { |
| requestAnimationFrame(draw); |
| }, 0); |
| } else { |
| // Normal frames. |
| document.getElementById('target').innerText = t; |
| requestAnimationFrame(draw); |
| } |
| }; |
| |
| let target = document.getElementById('target'); |
| test.step_timeout(test.step_func_done(() => { |
| assert_greater_than(parseInt(target.innerText), 500); |
| }), 550); |
| requestAnimationFrame(draw); |
| }); |
| </script> |
