CSS font stacks & developer FAQs with Web standards
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A: You should be very wary of interfering with the standard functionality of the browser's Back button, it is a greatly under-estimated feature that often acts as an escape route when users get lost or confused about what is happening on a Web site. Apart from providing a "panic" button, users may have very good reasons for wanting to go back; your site may not be responding as they would expect it to, the login or other transaction may appear to have failed.
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How can I stop users going back to a login page?
We love social media, but we do not expect you to create yet another public outpost on the Web.