Screenshot using html2canvas in Krpano

I'm trying to take a screen shot that captures all elements within a panoramic, hotspots, polygon hotspots, text etc..

I have tried the plugin on the plugin page, but it doesn't capture all the elements I want

I am using html2canvas and canvas.toblog to out put a jpg

but when I output I get text, and skin element but the scene and lines/polygons do not appear.

The embedded pano has these settings
html5:"only+webgl", webglsettings:{preserveDrawingBuffer:true}

anyone got any ideas, I'm using the script below to take the screenshot...

<script>
document.querySelector(".print-btn").addEventListener("click", function() {
html2canvas(document.body).then(function(canvas) {
canvas.toBlob(function(blob) {
saveAs(blob, "screenshot.jpeg");
}, "image/jpeg");
});}, false);
</script>

Attached are the the output and what it should look like