Edit in JSFiddle

const positionOnGlobe = { longitude: 2.3465, latitude: 48.88, altitude: 25000000 };

// creates viewerDiv and iTowns globeView
const viewerDiv = document.getElementById('viewerDiv');
const globeView = new itowns.GlobeViewExtended(viewerDiv, positionOnGlobe);

            var config = {};
            config.source = new itowns.WMTSSource({
                "url": "https://wxs.ign.fr/decouverte/geoportail/wmts",
                "crs": "EPSG:3857",
                "networkOptions": {
                    "crossOrigin": "anonymous"
                },
                "format": "image/jpeg",
                "attribution": {
                    "name": "IGN",
                    "url": "http://www.ign.fr/"
                },
                "name": "ORTHOIMAGERY.ORTHOPHOTOS",
                "tileMatrixSet": "PM",
                "tileMatrixSetLimits": {
                    "2": {
                        "minTileRow": 0,
                        "maxTileRow": 4,
                        "minTileCol": 0,
                        "maxTileCol": 4
                    },
                    "3": {
                        "minTileRow": 0,
                        "maxTileRow": 8,
                        "minTileCol": 0,
                        "maxTileCol": 8
                    },
                    "4": {
                        "minTileRow": 0,
                        "maxTileRow": 16,
                        "minTileCol": 0,
                        "maxTileCol": 16
                    },
                    "5": {
                        "minTileRow": 0,
                        "maxTileRow": 32,
                        "minTileCol": 0,
                        "maxTileCol": 32
                    },
                    "6": {
                        "minTileRow": 1,
                        "maxTileRow": 64,
                        "minTileCol": 0,
                        "maxTileCol": 64
                    },
                    "7": {
                        "minTileRow": 3,
                        "maxTileRow": 128,
                        "minTileCol": 0,
                        "maxTileCol": 128
                    },
                    "8": {
                        "minTileRow": 7,
                        "maxTileRow": 256,
                        "minTileCol": 0,
                        "maxTileCol": 256
                    },
                    "9": {
                        "minTileRow": 15,
                        "maxTileRow": 512,
                        "minTileCol": 0,
                        "maxTileCol": 512
                    },
                    "10": {
                        "minTileRow": 31,
                        "maxTileRow": 1024,
                        "minTileCol": 0,
                        "maxTileCol": 1024
                    },
                    "11": {
                        "minTileRow": 62,
                        "maxTileRow": 2048,
                        "minTileCol": 0,
                        "maxTileCol": 2048
                    },
                    "12": {
                        "minTileRow": 125,
                        "maxTileRow": 4096,
                        "minTileCol": 0,
                        "maxTileCol": 4096
                    },
                    "13": {
                        "minTileRow": 2739,
                        "maxTileRow": 4628,
                        "minTileCol": 41,
                        "maxTileCol": 7917
                    },
                    "14": {
                        "minTileRow": 5478,
                        "maxTileRow": 9256,
                        "minTileCol": 82,
                        "maxTileCol": 15835
                    },
                    "15": {
                        "minTileRow": 10956,
                        "maxTileRow": 18513,
                        "minTileCol": 165,
                        "maxTileCol": 31670
                    },
                    "16": {
                        "minTileRow": 21912,
                        "maxTileRow": 37026,
                        "minTileCol": 330,
                        "maxTileCol": 63341
                    },
                    "17": {
                        "minTileRow": 43825,
                        "maxTileRow": 74052,
                        "minTileCol": 660,
                        "maxTileCol": 126683
                    },
                    "18": {
                        "minTileRow": 87648,
                        "maxTileRow": 148111,
                        "minTileCol": 1312,
                        "maxTileCol": 253375
                    },
                    "19": {
                        "minTileRow": 175296,
                        "maxTileRow": 294063,
                        "minTileCol": 170144,
                        "maxTileCol": 343487
                    },
                    "20": {
                        "minTileRow": 357008,
                        "maxTileRow": 384687,
                        "minTileCol": 524400,
                        "maxTileCol": 540927
                    },
                    "21": {
                        "minTileRow": 714032,
                        "maxTileRow": 768783,
                        "minTileCol": 1048816,
                        "maxTileCol": 1081775
                    }
                }
            });

            config.id = "Ortho";
            var layer = new itowns.ColorLayer(config.id, config);
            globeView.addLayer(layer);
            
var config2 = {};
config2.source = new itowns.WMTSSource({
    "format": "image/x-bil;bits=32",
    "crs": "EPSG:4326",
    "url": "https://wxs.ign.fr/altimetrie/geoportail/wmts",
    "name": "ELEVATION.ELEVATIONGRIDCOVERAGE.SRTM3",
    "tileMatrixSet": "WGS84G",
    "tileMatrixSetLimits": {
        "3": {
            "minTileRow": 1,
            "maxTileRow": 6,
            "minTileCol": 0,
            "maxTileCol": 16
        },
        "4": {
            "minTileRow": 2,
            "maxTileRow": 12,
            "minTileCol": 0,
            "maxTileCol": 32
        },
        "5": {
            "minTileRow": 5,
            "maxTileRow": 25,
            "minTileCol": 0,
            "maxTileCol": 64
        },
        "6": {
            "minTileRow": 10,
            "maxTileRow": 51,
            "minTileCol": 0,
            "maxTileCol": 128
        },
        "7": {
            "minTileRow": 20,
            "maxTileRow": 103,
            "minTileCol": 0,
            "maxTileCol": 256
        },
        "8": {
            "minTileRow": 41,
            "maxTileRow": 207,
            "minTileCol": 0,
            "maxTileCol": 512
        },
        "9": {
            "minTileRow": 82,
            "maxTileRow": 415,
            "minTileCol": 0,
            "maxTileCol": 1024
        },
        "10": {
            "minTileRow": 164,
            "maxTileRow": 830,
            "minTileCol": 0,
            "maxTileCol": 2048
        }
    }
});

config2.id = "WorldMNT";
var layer = new itowns.ElevationLayer(config2.id, config2);
globeView.addLayer(layer);

// adds control
var attribution = new itowns.control.Attributions({
    options: {
        collapsed: false
    }
});

globeView.addWidget(attribution);

// itowns version info div
var infoDiv = document.getElementById("info");
infoDiv.innerHTML = "<p> Extension iTowns version " + Gp.itownsExtVersion + " (" + Gp.itownsExtDate + ")</p>";

<body>
  <div id="viewerDiv">
    <button id="tiltButton">
      jsFiddle bug - click on this text to activate tilt (ctrl + left click)
      <br>
      Do not integrate this button to your own non-jsFiddle pages
    </button>
  </div>
  <div id="info"></div>
</body>

html {
  height: 100%;
}

body {
  margin: 0;
  overflow: hidden;
  height: 100%;
}

#viewerDiv {
  margin: auto auto;
  width: 100%;
  height: 400px;
  padding: 0;
}

#tiltButton {
  background-color: white;
  position: absolute;
  top: 20px;
  left: 50px;
}

#info {
  padding: 5px;
  width: 100%;
  height: 20px;
  font-family: "monospace";
  font-size: 10px;
}