offline export : img.crossOrigin = 'Anonymous' fails on older versions of Firefox

[jlowcs]

Tested with FF v39: img.crossOrigin = 'Anonymous' results on a failed export (img.onerror is called).

Why this option ?

[oysteinmoseng]

The property is set because of CORS issues with drawing to canvas in some browsers. Will look into not setting it for older FF.

Would you happen to have a jsFiddle demo for testing?

Edit: FF v39 seems to require this option at least in order not to break on SVG with cross domain images embedded. In which use case did it break things?

[jlowcs]

It was a PNG export without CORS.

Edit: PNG export fails on your client side jsfiddle with FF 39 (uncaught exception: Fallback to export server disabled)

[oysteinmoseng]

I revamped the logic to now always try without crossOrigin='Anonymous' first, and then retry with the property set if it fails with security errors.

[jlowcs]

👍