[Inkscape-docs] full size image/outside link

Hi Friends, I was just looking at a new exension that's been uploaded to the website:

https://inkscape.org/en/~pacogarcia/%E2%98%85inkscape-to-povray-exporter

How did he make the outside link, when you click on the image? All the other extensions that I've looked at, when you click on the image, either you're offered the file (usually zip file) to be downloaded or you see the full size image. I mean, I realize that the link goes to his site, where the file can be downloaded. I just can't figure out how he made that link. Nothing urgent. Just curious :-)

Thanks, brynn