jsPDF Watermark

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.3.3/jspdf.min.js"></script>
<div>
  <button id="getPdf">Get PDF</button>
</div>

JavaScript

//Add event listener
document.getElementById("getPdf").addEventListener("click", getPdf);

var imgData =...