Canon EOS Rebel T3 18-55mm IS II Lens Kit - Manual (Page 145)

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The menu options displayed under the [w], [x], and [y] tabs are
explained below.
[w] tab
AF mode
The AF modes will be the same as described on pages 128-134.
You can select [Live mode], [u Live mode], or [Quick mode]. Note
that continuous focusing of a moving subject is not possible.
AF with shutter button during k (movie recording)
When [Enable] is set, AF is possible during movie shooting.
However, continuous autofocusing is not possible. If you autofocus
during movie shooting, you might momentarily throw the focus way
off or change the exposure. The movie will also record the lens
operation noise.
During movie shooting, if the [Quick mode] AF mode is set, AF will
be executed in [Live mode].
3 Menu Function Settings
The settings under the [w/x/y] menu tabs will take effect only
in the <k> mode. They will not be applied in shooting modes other
than the <k> mode.
The [AF mode] setting will also be applied to Live View shooting.
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