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