| <html> |
| <head> |
| <script src="../../resources/js-test.js"></script> |
| <script> |
| description('<a href="https://bugs.webkit.org/show_bug.cgi?id=98474">Bug 98474</a>: Throttle DOM timers on hidden pages.'); |
| |
| var jsTestIsAsync = true; |
| var previousTime = 0; |
| var timerCount = 0; |
| var firstTimerWhileNotVisible = true; |
| var isPageVisible = true; |
| var timeoutInterval = 100; |
| var tolerance = 20; |
| var timerAlignmentInterval = 1000; |
| |
| function testTimer() |
| { |
| var time = Date.now(); |
| if (!isPageVisible) { |
| if (firstTimerWhileNotVisible) { |
| firstTimerIntervalWhilePageNotVisible = time - previousTime; |
| var minValue = timeoutInterval - tolerance; |
| shouldBeGreaterThanOrEqual("firstTimerIntervalWhilePageNotVisible", minValue.toString()); |
| var maxValue = timeoutInterval + timerAlignmentInterval + tolerance; |
| shouldBeTrue("firstTimerIntervalWhilePageNotVisible <= " + maxValue); |
| firstTimerWhileNotVisible = false; |
| } else { |
| timerIntervalWhilePageNotVisible = time - previousTime; |
| shouldBeCloseTo("timerIntervalWhilePageNotVisible", timerAlignmentInterval, tolerance); |
| } |
| } else { |
| timerIntervalWhilePageVisible = time - previousTime; |
| shouldBeCloseTo("timerIntervalWhilePageVisible", timeoutInterval, tolerance); |
| } |
| |
| timerCount++; |
| previousTime = time; |
| |
| if (timerCount == 1) { |
| testRunner.setPageVisibility("hidden"); |
| isPageVisible = false; |
| } else if (timerCount == 3) { |
| testRunner.setPageVisibility("visible"); |
| isPageVisible = true; |
| } else if (timerCount >= 5) { |
| finishJSTest(); |
| return; |
| } |
| previousTime = Date.now(); |
| setTimeout(testTimer, timeoutInterval); |
| } |
| |
| function runTest() |
| { |
| if (!window.testRunner) { |
| debug('This test requires testRunner'); |
| return; |
| } |
| |
| var timeoutIntervalSpans = document.getElementsByClassName('timeoutInterval'); |
| for (var i = 0; i < timeoutIntervalSpans.length; i++) |
| timeoutIntervalSpans[i].innerText = timeoutInterval; |
| |
| document.getElementById('alignmentInterval').innerText = timerAlignmentInterval / 1000; |
| |
| testRunner.dumpAsText(); |
| previousTime = Date.now(); |
| setTimeout(testTimer, timeoutInterval); |
| } |
| </script> |
| </head> |
| <body onload="runTest()"> |
| <p> |
| This test measures the time taken to fire a <span class="timeoutInterval"></span>ms DOM Timer when the page visibility is set to "visible", "hidden", and then back to "visible". Due to page timer throttling, the timer should fire close to <span id="alignmentInterval"></span>s when page is hidden. And it should fire close to <span class="timeoutInterval"></span>ms, when the page is visible. |
| </p> |
| </body> |
| </html> |
