[Silhouette]

Remember that hardly anyone's last words on their death bed are "I wish I had spent more time at work." You're young and early in your career. You have many professional opportunities ahead of you no matter what you choose here.

On the other hand, personal opportunities like this don't come along very often. I've known a few friends and family do something big like this in their 20s, and without exception they have had amazing experiences and no serious regrets in the long term, even if settling back in when they first came home wasn't entirely easy.

Only you can weigh up the pros and cons in your personal situation, but as long as you're being financially sensible and you're not damaging your current employer unreasonably by leaving so soon, I think it is extremely unlikely that you'll do any serious or permanent damage to your career if you decide to go.

By the way, web dev doesn't really move very fast. If you stick with it as a career then some time over the next 10-20 years you'll come to realise that the fundamentals actually evolve very slowly. The illusion of rapid change is mostly perpetuated by blogs and online forums and conferences that always want the next big thing to talk about, but they're mostly just talking about superficial things like which tool or framework to use. If you decide to go then nothing that really matters in web dev is going to have shifted so far in a few months that you can't catch up very quickly when you get back.