LayoutTests/requestidlecallback/requestidlecallback-starved-by-setInterval.html

<!DOCTYPE html><!-- webkit-test-runner [ RequestIdleCallbackEnabled=true ] -->
<html>
<body>
<script src="../resources/js-test.js"></script>
<script>

description('This tests that idle callbacks are not starved by setInterval().');

jsTestIsAsync = true;

// The interval needs to fire enough times to exercise the maximum timer nesting level.
const totalFirings = 20;
let firingCount = 0;
let idleCallbackCount = 0;
const interval = setInterval(() => {
    if (++firingCount > totalFirings)
        return;
    requestIdleCallback(() => {
        // Don't report each interaction: updating rendering would affect scheduling, giving idle callbacks a chance to run:
        if (++idleCallbackCount < totalFirings)
            return;
        clearInterval(interval);
        testPassed('All idle callbacks ran.');
        finishJSTest();
    });
}, 50);

</script>
</body>
</html>