Simple DynamicMapLayer
Display a Map Service from ArcGIS Online or ArcGIS Server. If the service is published in a different coordinate system than the map, it will reproject on the fly automatically. More information about Map Services can be found in the L.esri.DynamicMapLayer documentation.
<html>
<head>
<meta charset="utf-8" />
<title>Simple DynamicMapLayer</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<!-- Load Leaflet from CDN -->
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.5.1/dist/leaflet.css"
integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ=="
crossorigin=""/>
<script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js"
integrity="sha512-GffPMF3RvMeYyc1LWMHtK8EbPv0iNZ8/oTtHPx9/cc2ILxQ+u905qIwdpULaqDkyBKgOaB57QTMg7ztg8Jm2Og=="
crossorigin=""></script>
<!-- Load Esri Leaflet from CDN -->
<script src="https://unpkg.com/esri-leaflet@2.3.0/dist/esri-leaflet.js"
integrity="sha512-1tScwpjXwwnm6tTva0l0/ZgM3rYNbdyMj5q6RSQMbNX6EUMhYDE3pMRGZaT41zHEvLoWEK7qFEJmZDOoDMU7/Q=="
crossorigin=""></script>
<style>
body { margin:0; padding:0; }
#map { position: absolute; top:0; bottom:0; right:0; left:0; }
</style>
</head>
<body>
<div id="map"></div>
<script>
var map = L.map('map').setView([37.71, -99.88], 4);
L.esri.basemapLayer('Gray').addTo(map);
L.esri.dynamicMapLayer({
url: 'https://services.arcgisonline.com/arcgis/rest/services/Specialty/Soil_Survey_Map/MapServer',
opacity: 0.7
}).addTo(map);
</script>
</body>
</html>