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Re:Ask HN: Is it still too hard to allow “back” buttons on a... by squarepirate on Monday November 16, 2015 @04:24AM (#10573437)
I google that and this was my third result.

http://www.gcflearnfree.org/internetsafety/6/print

Topic 6 talks about it. So simple.

Re:Ask HN: Is it still too hard to allow “back” buttons on a... by austinjp on Monday November 16, 2015 @05:18AM (#10573606)
I suspect the OP is asking why bank websites do not gracefully handle the back button and prevent the errors mentioned on that page.
Re:Ask HN: Is it still too hard to allow “back” buttons on a... by wodenokoto on Monday November 16, 2015 @05:17AM (#10573605)
Except that you don't get charged twice on Amazon or basically any web merchant when using the back button.
Re:Ask HN: Is it still too hard to allow “back” buttons on a... by mcv on Monday November 16, 2015 @06:28AM (#10573829)
You won't get charged twice on any well-written site, but I'm still careful with the back button around any transaction.

It's not really an issue at either of my banks, because a transaction is a lot more than merely submitting a form, and requires authorization with a single-use code. But webshops tend to have far more linear transactions, and I don't always fully trust them to use the back button the way I think it should work.