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chromium/third_party/blink/web_tests/wpt_internal/geolocation-api/success-clear-watch.https.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/testharness-adapter.js"></script>
</head>
<body>
<script type="module">
import {GeolocationMock} from './resources/geolocation-mock.js';

description("This tests removing the watcher from a position callback does not causes assertions.");

const mockLatitude = 51.478;
const mockLongitude = -0.166;
const mockAccuracy = 100;

const mock = new GeolocationMock();
mock.setGeolocationPermission(true);
mock.setGeolocationPosition(mockLatitude,
                            mockLongitude,
                            mockAccuracy);

const watchId = navigator.geolocation.watchPosition(function() {
    navigator.geolocation.clearWatch(watchId);
    finishJSTest();
}, function(e) {
    navigator.geolocation.clearWatch(watchId);
    finishJSTest();
});
</script>
</body>
</html>