| <!DOCTYPE html><!-- webkit-test-runner [ experimental:RequestIdleCallbackEnabled=true ] --> |
| <title>window.requestIdleCallback callback behavior during idle periods.</title> |
| <link rel="author" title="Ross McIlroy" href="mailto:rmcilroy@chromium.org" /> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| |
| async_test(function() { |
| // Check that if an idle callback calls requestIdleCallback, the new callback |
| // doesn't get the same deadline (i.e., runs in a new idle period). |
| var previous_deadline = undefined; |
| var idle_callbacks_remaining = 10; |
| var rIC = this.step_func(function(deadline) { |
| var now = performance.now(); |
| var remaining = deadline.timeRemaining(); |
| var new_deadline = now + remaining; |
| if (previous_deadline != undefined) { |
| assert_true(new_deadline > previous_deadline, "A requestIdleCallback scheduled during an idle period should be called back with a deadline greater than that in the current idle period."); |
| } |
| |
| // Schedule a new requestIdleCallback. |
| if (--idle_callbacks_remaining > 0) { |
| previous_deadline = new_deadline; |
| requestIdleCallback(rIC); |
| } else { |
| this.done(); |
| } |
| }); |
| |
| // Spin an empty rAF loop to cause an idle period each frame. |
| var idle_task_posted = false; |
| requestAnimationFrame(function rAFLoop() { |
| if (!idle_task_posted) { |
| requestIdleCallback(rIC); |
| idle_task_posted = true; |
| } |
| requestAnimationFrame(rAFLoop); |
| }); |
| }, 'Check that if an idle callback calls requestIdleCallback the new callback doesn\'t run in the current idle period.'); |
| </script> |
| <h1>Test of requestIdleCallback idle period behavior</h1> |
| <p>This test validates that window.requestIdleCallback deals with callbacks during idle periods correctly.</p> |
| <div id="log"></div> |
