JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://rawgit.com/niklasvh/html2canvas/master/dist/html2canvas.min.js"></script>
<div id="content">
    <img id="img1" src="http://www.completeleasing.co.uk/media/sector%20images/software-2.jpg">
    <img id="img2" src="http://www.ipwatchdog.com/wp-content/uploads/2015/08/programing-software.jpg">
    <img id="img3" src=" http://www.sikich.com/blog/image.axd?picture=%2F2014%2F04%2FTeam.jpg">   
</div>
<br><br><br><br><br><br><br><br><br><br><br><br>
<input id="button" type="button" value="convert div to image"><br>
<h3>result:</h3>
<div id="result"></div>
<a id="download" download="my_image.png" href="#">Download image</a>

CSS

#content {
    position: absolute;
    width: 300px;
    height: 200px;
    border: 5px solid red;
    overflow: hidden;
}

#img1 {
    width: 300px;
    height: 200px;
    position: absolute;
    z-index: 5;
}

#img2 {
    position: absolute;
    z-index: 6;

    width: 150px;
    height: 190px;
}

#img3 {
    position: absolute;
    z-index: 7;
    width: 200px;
    height: 100px;
}

#download {
    display: none;
}

JavaScript

var download = document.getElementById("download"),
		result = document.getElementById("result");

function renderContent() {
    html2canvas(document.getElementById("content"), {
        allowTaint: true
    }).then(function(canvas) {
    		result.appendChild(canvas);
        download.style.display = "inline";
    });
}

function downloadImage() {
		download.href = result.children[0].toDataURL("image/png");
}

document.getElementById("button").onclick = renderContent;
download.onclick = downloadImage;