You can do that with the Google Chrome and other browsers in development mode, press F12 if an album is displayed on a PC with Chrome.
See also enclosed screenshots.
Thanks for the pointer!
I am a bit non-plussed, though. I set up the screen resolution for a Samsung S7 (and S3), and Chrome presents something much different to how it actually appears on the devices.
I went back to jAlbum and the built-in browser, and had to use the "Galaxy Note 3 (*360 x 640*)" to make it look like it does on my S7 (which has a far higher screen resolution in pixels).
Maybe I'm missing something ......