Thanks for raising @jjbully, can you confirm where this was linked from as while it's still live it's pretty out-of-date? Also for reference if you drop the .html extension the page renders ok: https://trufflesuite.com/guides/building-testing-frontend-app-truffle-3/

Thanks again 👍

Looks like this link is not broken, @jjbully can you tell us where you found this link? We want to be sure to update it. Thanks!

Hm, that link definitely does 404... we'll have to do something about that. Thanks for bringing this up!