Tools/TestWebKitAPI/Resources/geolocationWatchPosition.html - external/github.com/WebKit/webkit - Git at Google

 <script>
 navigator.geolocation.watchPosition(function() { setTimeout(() => alert("SUCCESS"), 0); }, function() { setTimeout(() => alert("FAIL"), 0); }, {timeout: 100});
 </script>
	<script>
	navigator.geolocation.watchPosition(function() { setTimeout(() => alert("SUCCESS"), 0); }, function() { setTimeout(() => alert("FAIL"), 0); }, {timeout: 100});
	</script>