Is it really all that hard to have a demo site for these things? It would be a lot of fun to play with crossing pictures. I'm guessing it's because using a graphics card in the browser isn't good enough yet?
A few months ago, there was TensorFire [0] that was able to do it in the browser. Quick google also gives other results [1]. There's also many apps that can do it in seconds. Speed definitely isn't an issue anymore, but getting it to work in browser can be tricky.
[0] https://tenso.rs/demos/fast-neural-style/
[1] https://reiinakano.github.io/fast-style-transfer-deeplearnjs...