41 lines
1.3 KiB
HTML
41 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<body>
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<script src="../../resources/js-test-pre.js"></script>
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<div id="testElement">Test</div>
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<script>
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description("Tests that a repeating timer changing the style of a visible element does not get throttled.");
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jsTestIsAsync = true;
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var iterationCount = 0;
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var timeoutId;
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var testElement = document.getElementById("testElement");
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var wasThrottled = false;
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function timerCallback()
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{
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++iterationCount;
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// Interact with the style of the element.
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testElement.style["left"] = "" + iterationCount + "px";
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// 5 iterations should suffice to throttle the timer.
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if (iterationCount == 5) {
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// Do not use shouldBeTrue() here because it would cause a DOM tree mutation and
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// unthrottle the DOM Timer.
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wasThrottled = internals.isTimerThrottled(timeoutId);
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} else if (iterationCount == 6) {
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debug("5th iteration, timer should not have been throttled.");
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shouldBeFalse("wasThrottled");
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debug("6th iteration, timer should still be unthrottled.");
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shouldBeFalse("internals.isTimerThrottled(timeoutId)");
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clearInterval(timeoutId);
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finishJSTest();
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}
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}
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timeoutId = setInterval(timerCallback, 10);
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debug("The timer should initially not be throttled.");
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shouldBeFalse("internals.isTimerThrottled(timeoutId)");
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</script>
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<script src="../../resources/js-test-post.js"></script>
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</body>
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