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<!DOCTYPE html>
<title>The interval property must be expressed in milliseconds. It must be a constant, to simplify filtering of the data by the Web application</title>
<meta name=viewport content="width=device-width, maximum-scale=1.0">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="author" title="Mosquito FP7">
<link rel="reviewer author" title="Zhiqiang Zhang" href=""> <!-- 2013-10-14 -->
<p>Move the device to run the test.</p>
<div id="log"></div>
var t = async_test("The interval property must be different to zero and must be a constant");
var inter1 = 0;
var inter2 = 0;
var run = false;
window.addEventListener("devicemotion", function(e) {
if (!run) {
run = true;
t.step(function() {
if (inter1 == 0) {
inter2 = e.interval;
inter1 = e.interval;
assert_not_equals(inter1, 0);
assert_not_equals(inter1, inter2);
}, false);