A simple customelement wrapper for qrcode.js
No more id nonsense... just add a tag for it
<!doctype html>
<html>
<head>
<script src="https://cdn.jsdelivr.net/gh/davidshimjs/qrcodejs@master/qrcode.js"></script>
<script src="qr_widget.js"></script>
</head>
<body>
<qr-code width="400" height="400" style="box-shadow: 10px 5px 5px black;">https://cdn.jsdelivr.net/gh/davidshimjs/qrcodejs@master/qrcode.js</qr-code>
</body>
</html>