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HTML

<html>
<head>
	<title>Leaflet GeoJSON Example</title>
	<meta charset="utf-8" />

    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>

	<link rel="stylesheet" href="http://leafletjs.com/dist/leaflet.css" />
</head>
<body>
	<div id="map" style="width: 800px; height: 500px"></div>

	
	<script src="http://leafletjs.com/dist/leaflet.js"></script>
	<script type="text/javascript" src="https://rawgit.com/calvinmetcalf/leaflet-ajax/master/dist/leaflet.ajax.js"></script>

	<script>
		var map = L.map('map').setView([48.8,2.23], 13);

		L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
		    attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
		}).addTo(map); 



		var url ="http://services.arcgis.com/d3voDfTFbHOCRwVR/arcgis/rest/services/Tramway_ligne_T6/FeatureServer/0/query?where=Debut_Fin+%3D+0+&outFields=*&outSR=4326&f=geojson"

		var geojsonLayer = new L.GeoJSON.AJAX(url,{});
	
		geojsonLayer.addTo(map);

	</script>
</body>
</html>