There is a setting on the Canon EOS T4i where it will take three shots and over- under- expose them and then put ‘em together, in other words HDR, in order to deal with typical backlit scenes like this one (the window was at least four stops over the interior of the bus).
It’s possible to use but difficult with moving people (same for any HDR) except that if you do your own HDR you have more control later in the post-processing in terms of dealing with movement. The other downside of the built-in HDR is that it gives you a JPG. Nevertheless, this shows it is possible to get something decent from it. I believe the shutter fires faster than when you do the usual bracketing. But I took about six shots, and this is the only usable one.
On the other hand, if you were out at night, and were going to photograph something static – you might want to use this internal HDR.
