<script src="https://cdn.bootcdn.net/ajax/libs/html2canvas/1.4.1/html2canvas.min.js"></script>
new html2canvas(document.getElementById('js_content'), {
allowTaint:true,
useCORS:true,
width:$("#js_content").width(),
height:$("#js_content").width()*0.7
}).then(canvas => {
html2canvas_img = canvas.toDataURL();
});
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