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HTML

              
                <!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <!-- Responsive -->
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <meta name="mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="default">
    <!-- End Responsive -->
    <script src="https://s3-us-west-1.amazonaws.com/patterns.esri.com/files/calcite-web/1.1.0/js/calcite-web.min.js"></script>
    <link rel=icon href=assets/favicon.ico sizes="32x32" type="image/vnd.microsoft.icon">
    <link rel="stylesheet" href="https://s3-us-west-1.amazonaws.com/patterns.esri.com/files/calcite-web/1.1.0/css/calcite-web.min.css">
  <link rel="stylesheet" href="https://jsdev.arcgis.com/4.12/esri/css/main.css">

<!--     <script src="https://unpkg.com/html2canvas@1.0.0-alpha.12/dist/html2canvas.js"></script> -->
  <script src="https://cdn.jsdelivr.net/npm/html2canvas@1.0.0-alpha.12/dist/html2canvas.js"></script>
    <script src="https://jsdev.arcgis.com/4.12/"></script>
</head>

<body>
    <div id="viewDiv">
        <button id="screenshotBtn" class="action-button" aria-label="Take a screenshot" title="Take a screenshot">Take a screenshot</button>
    </div>
    <div id="screenshotDiv" class="hide">
        <div>
            <img class="js-screenshot-image">
        </div>
        <div>
             <button class="download-button action-button" aria-label="Download image" title="Download image">Download image</button>
            <button id="closeBtn" class="action-button" aria-label="Back to webmap" title="Back to webmap">Back to webmap</button>
        </div>

    </div>
    <div id="maskDiv" class="hide screenshotCursor"></div>
</body>

</html>
              
            
!

CSS

              
                html,
body,
#viewDiv {
    padding: 0;
    margin: 0;
    height: 100%;
    width: 100%;
    font-family: Helvetica, Arial, sans-serif;
}

.js-screenshot-image {
  background-color: #fff;
  max-width: 85%;
}

#screenshotDiv {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    text-align: center;
    background-color: rgba(255, 255, 255, 0.8);
    z-index: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.hide {
    display: none;
}

img {
    border: 10px solid white;
    box-shadow: 2px 2px 5px 0 rgba(0, 0, 0, 0.5);
}

#screenshotDiv>* {
    margin: 0.5em;
}

.screenshotCursor {
    cursor: crosshair;
}

.action-button {
    padding: 0.6em;
    border: 1px solid #0079c1;
    text-align: center;
    background-color: white;
    cursor: pointer;
}

.action-button:hover,
.action-button:focus {
    background: #0079c1;
    color: white;
}

#maskDiv {
    position: absolute;
    background: rgba(255, 51, 0, 0.1);
    border: 2px dashed rgb(255, 51, 0);
}

#screenshotBtn:disabled {
  opacity: 0.8;
}
              
            
!

JS

              
                require(["esri/WebMap", "esri/views/MapView", "esri/widgets/Legend"], function(
  WebMap,
  MapView,
  Legend
) {
  const webmap = new WebMap({
    portalItem: {
      id: "79cce2e1be8e451f8883fde8d964429c"
    }
  });

  const view = new MapView({
    map: webmap,
    container: "viewDiv"
  });

  const legend = new Legend({
    view
  });

  view.ui.add(legend, "bottom-left");
  // the button that triggers area selection mode
  const screenshotBtn = document.getElementById("screenshotBtn");

  // the orange mask used to select the area
  const maskDiv = document.getElementById("maskDiv");

  // element where we display the print preview
  const screenshotDiv = document.getElementById("screenshotDiv");

  view.ui.add(screenshotBtn, "top-left");

  // add an event listener to trigger the area selection mode
  screenshotBtn.addEventListener("click", () => {
    screenshotBtn.classList.add("active");
    view.container.classList.add("screenshotCursor");
    let area = null;

    // listen for drag events and compute the selected area
    const dragHandler = view.on("drag", event => {
      // prevent navigation in the view
      event.stopPropagation();

      // when the user starts dragging or is dragging
      if (event.action !== "end") {
        // calculate the extent of the area selected by dragging the cursor
        const xmin = clamp(Math.min(event.origin.x, event.x), 0, view.width);
        const xmax = clamp(Math.max(event.origin.x, event.x), 0, view.width);
        const ymin = clamp(Math.min(event.origin.y, event.y), 0, view.height);
        const ymax = clamp(Math.max(event.origin.y, event.y), 0, view.height);
        area = {
          x: xmin,
          y: ymin,
          width: xmax - xmin,
          height: ymax - ymin
        };
        // set the position of the div element that marks the selected area
        setMaskPosition(area);
      }
      // when the user stops dragging
      else {
        // remove the drag event listener from the view
        dragHandler.remove();
        // the screenshot of the selected area is taken
        view
          .takeScreenshot({
            area,
            format: "png"
          })
          .then(screenshot => {
            const viewCanvas = document.createElement("canvas");
            const img = document.createElement("img");

            html2canvas(document.querySelector(".esri-legend")).then(
              legendCanvas => {
                viewCanvas.height = screenshot.data.height;
                viewCanvas.width = screenshot.data.width;
                const context = viewCanvas.getContext("2d");
                img.src = screenshot.dataUrl;
                img.onload = function() {
                  context.drawImage(img, 0, 0);
                  const viewLegendCanvas = document.createElement("canvas");
                  const combinedCanvasContext = viewLegendCanvas.getContext(
                    "2d"
                  );
                  const viewScreenshotHeight = screenshot.data.height;
                  const legendCanvasHeight = legendCanvas.height;
                  viewLegendCanvas.width =
                    screenshot.data.width + legendCanvas.width;
                  viewLegendCanvas.height =
                    viewScreenshotHeight > legendCanvasHeight
                      ? viewScreenshotHeight
                      : legendCanvasHeight;
                  combinedCanvasContext.drawImage(legendCanvas, 0, 0);
                  combinedCanvasContext.drawImage(
                    viewCanvas,
                    legendCanvas.width,
                    0
                  );
                  showPreview(viewLegendCanvas);
                  downloadButton(viewLegendCanvas);
                };
              }
            );

            // the screenshot mode is disabled
            screenshotBtn.classList.remove("active");
            view.container.classList.remove("screenshotCursor");
            setMaskPosition(null);
          });
      }
    });

    function setMaskPosition(area) {
      if (area) {
        maskDiv.classList.remove("hide");
        maskDiv.style.left = area.x + "px";
        maskDiv.style.top = area.y + "px";
        maskDiv.style.width = area.width + "px";
        maskDiv.style.height = area.height + "px";
      } else {
        maskDiv.classList.add("hide");
      }
    }

    function clamp(value, from, to) {
      return value < from ? from : value > to ? to : value;
    }

    function downloadButton(canvasElement) {
      const downloadBtn = document.querySelector(".download-button");
      downloadBtn.onclick = function() {
        downloadImage(
          webmap.portalItem.title + ".png",
          canvasElement.toDataURL()
        );
      };
    }

    function downloadImage(filename, dataUrl) {
      if (!window.navigator.msSaveOrOpenBlob) {
        const element = document.createElement("a");
        element.setAttribute("href", dataUrl);
        element.setAttribute("download", filename);
        element.style.display = "none";
        document.body.appendChild(element);
        element.click();
        document.body.removeChild(element);
      } else {
        const byteString = atob(dataUrl.split(",")[1]);
        const mimeString = dataUrl
          .split(",")[0]
          .split(":")[1]
          .split(";")[0];
        const ab = new ArrayBuffer(byteString.length);
        const ia = new Uint8Array(ab);
        for (let i = 0; i < byteString.length; i++) {
          ia[i] = byteString.charCodeAt(i);
        }
        const blob = new Blob([ab], { type: mimeString });
        window.navigator.msSaveOrOpenBlob(blob, filename);
      }
    }
  });

  // creates an image that will be appended to the DOM
  function showPreview(viewLegendCanvas) {
    screenshotDiv.classList.remove("hide");
    // add the screenshot dataUrl as the src of an image element
    const screenshotImage = document.getElementsByClassName(
      "js-screenshot-image"
    )[0];
    screenshotImage.width = viewLegendCanvas.width;
    screenshotImage.height = viewLegendCanvas.height;
    screenshotImage.src = viewLegendCanvas.toDataURL();
  }

  // button to hide the print preview html element
  document.getElementById("closeBtn").addEventListener("click", function() {
    screenshotDiv.classList.add("hide");
  });
});

              
            
!
999px

Console