stevage/index.html

## index.html
<!DOCTYPE html>
<html lang="en">
<body>
    <iframe id="embedded-national-map" frameBorder="0" width="1200" height="600" src="http://nationalmap.gov.au/#clean"></iframe>
    <script>

    var xhr2 = new XMLHttpRequest();
    xhr2.open('GET', 'polygon.geojson', true);
    xhr2.onload = function() {
        if (xhr2.status === 200) {
            if (xhr2.response) {
                var item = {
                    type: 'geojson',
                    name: 'geojson polygon',
                    isEnabled: true,
                    data: xhr2.response
                }
                addToMap(item);
            }
        }
    }
    xhr2.onerror = function(e) { throw e; };
    xhr2.send();

    function addToMap(item) {
        window.addEventListener('message', function(e) {
            var iframeWindow = document.getElementById('embedded-national-map').contentWindow;
            if (e.source === iframeWindow && e.data === 'ready') {
                iframeWindow.postMessage({
                    initSources: [{catalog: [{
                        type: "group",
                        name: "Additional Data",
                        items: [item]
                    }]}]
                }, 'http://nationalmap.gov.au/');
            }
        });
    }
    </script>
</body>

</html>
	<!DOCTYPE html>
	<html lang="en">
	<body>
	<iframe id="embedded-national-map" frameBorder="0" width="1200" height="600" src="http://nationalmap.gov.au/#clean"></iframe>
	<script>

	var xhr2 = new XMLHttpRequest();
	xhr2.open('GET', 'polygon.geojson', true);
	xhr2.onload = function() {
	if (xhr2.status === 200) {
	if (xhr2.response) {
	var item = {
	type: 'geojson',
	name: 'geojson polygon',
	isEnabled: true,
	data: xhr2.response
	}
	addToMap(item);
	}
	}
	}
	xhr2.onerror = function(e) { throw e; };
	xhr2.send();

	function addToMap(item) {
	window.addEventListener('message', function(e) {
	var iframeWindow = document.getElementById('embedded-national-map').contentWindow;
	if (e.source === iframeWindow && e.data === 'ready') {
	iframeWindow.postMessage({
	initSources: [{catalog: [{
	type: "group",
	name: "Additional Data",
	items: [item]
	}]}]
	}, 'http://nationalmap.gov.au/');
	}
	});
	}
	</script>
	</body>

	</html>