Download image as PDF

[irisTa56]

In plotly.js/src/snapshot/download.js, Promise returned by toImage() resolves SVG data i.e. result passed to fileSaver() is SVG data if opts.format = 'svg'.
So, modification of the result before passing it to fileSaver() is a possible way to make PDF data.

For making PDF data, the below library might be useful:

https://github.com/yWorks/svg2pdf.js