Download this 1 long line <script src="https://leathan.xyz/compressed.js"></script>

Then in the console type keys = cnUtil.create_address((seed=cnUtil.sc_reduce32(cnUtil.rand_32())));
Here is an example
document.getElementById("spend_key").innerHTML = keys.spend.sec;

#SPEND_KEY
document.getElementById("view_key").innerHTML = keys.view.sec;

#VIEW_KEY
document.getElementById("address").innerHTML = cnUtil.pubkeys_to_string(keys.spend.pub, keys.view.pub);

#ADDRESS
document.getElementById("mn_encode").innerHTML = mn_encode(seed, (current_lang = 'english'))

#MN_ENCODE