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<?xml version = '1.0' encoding = 'utf-8'?>
<head>
<script>
function doTest() {
var defaultZoom = {}, allowZoom = {}, minZoom = {}, maxZoom ={}, width = {}, height = {}, autoSize = {};
var windowUtils = window.windowUtils;
windowUtils.getViewportInfo(1, 1, defaultZoom, allowZoom, minZoom, maxZoom, width, height, autoSize);
document.getElementById("minZoom").innerHTML = minZoom.value.toPrecision(10);
document.getElementById("maxZoom").innerHTML = maxZoom.value.toPrecision(10);
}
</script>
</head>
<body onload="doTest();">
MinZoom: <span id="minZoom"></span><br />
MaxZoom: <span id="maxZoom"></span>
</body>
</html>