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Comment by wil421 | Hacker News Reader

How do they determine what browser version users are on so they can show the right version of jellydoughnut-xx?

He kind of skips over this, but the way he says you don't even get served the "collection of files" until your browser is determined makes me think they're using the request header.

So maybe that 8.48% decrease is just people starting to spoof.

I feel like if you're savvy enough to be using Trello and yet still on IE9, there might be a reason you haven't upgraded.

How many people who use trello even knows how to get IE9 to spoof a UA header? I sure don't. And if they can't update their browser, they probably can't put some sort of request proxy in between to change headers.

What, so you spoof your client so you can get a version that's unusable in your browser because of its poor feature support? That doesn't sound like a great idea.

If you're desperate for new features, you might not care if the CSS is a little wonky.

That's not a good idea, for the record. We dropped IE9 so that core features could drop IE9 support, not to save a little CSS work. In the near future Trello will become quite unstable in IE9.

>still on IE9, there might be a reason you haven't upgraded.

Corporate IT users sometimes dont have a choice which is the case for some users on my current project. 2011 isnt that long ago to support something for a corporate app but I guess things move much faster other places.

That's my point -- if you haven't upgraded by now, you might not be able to. Period. Which is not to say I think they should fully support IE9. I'm just saying that (maybe misguidedly) I expect Trello users to be a little smarter than the average bear.

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