| <html><!-- webkit-test-runner [ HiddenPageDOMTimerThrottlingEnabled=true ] --> |
| <body> |
| <script src="../../resources/js-test.js"></script> |
| <script> |
| description('Tests that DOM timers gets throttled on hidden pages once they reach the max nesting level'); |
| jsTestIsAsync = true; |
| |
| let timerCount = 0; |
| const timeoutInterval = 10; |
| const maxNestingLevel = 10; |
| let timerHandle = 0; |
| let timerStartTime = 0; |
| let timerEndTime = 0; |
| const timerFiredTimes = []; |
| |
| function testTimer() |
| { |
| ++timerCount; |
| |
| timerEndTime = performance.now(); |
| |
| timerHandle = setTimeout(testTimer, timeoutInterval); |
| timerFiredTimes.push(timerEndTime - timerStartTime); |
| if (timerCount > 2 * maxNestingLevel) { |
| unthrottledCount = 0; |
| throttledCount = 0; |
| for (let i = 0; i < timerCount; ++i) { |
| if (timerFiredTimes[i] < 300) |
| unthrottledCount++; |
| else |
| throttledCount++; |
| } |
| shouldBeTrue('throttledCount > maxNestingLevel / 2'); |
| shouldBeTrue('unthrottledCount > maxNestingLevel / 2'); |
| testRunner.resetPageVisibility(); |
| clearTimeout(timerHandle); |
| finishJSTest(); |
| return; |
| } |
| timerStartTime = timerEndTime; |
| } |
| |
| function runTest() |
| { |
| if (!window.testRunner) { |
| debug('This test requires testRunner'); |
| return; |
| } |
| |
| timerStartTime = performance.now(); |
| timerHandle = setTimeout(testTimer, timeoutInterval); |
| } |
| onload = function() { |
| document.onvisibilitychange = () => { |
| if (!document.hidden) |
| return; |
| document.onvisibilitychange = null; |
| runTest(); |
| }; |
| testRunner.setPageVisibility("hidden"); |
| }; |
| </script> |
| </body> |
| </html> |
