Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 234)

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Recording HDR Movies
You can reduce the clipped highlights of bright areas, which may make
details hard to see, as you shoot movies even in high-contrast scenes.
The recording size is
L6X
(NTSC) or
L5X
(PAL).
1
Set the Mode Dial to < 8 >.
2
Shoot an HDR movie.
z Since multiple frames are merged to create an HDR movie, certain parts
of the movie image may look distorted. During handheld shooting, camera
shake may make the distortion look more noticeable. Using a tripod is
recommended. Note that even if a tripod is used for shooting, afterimages
or noise may become more noticeable when the HDR movie is played back
frame-by-frame or in slow-motion compared to normal playback.
z Movie digital zoom, time-lapse movie, and Movie digital IS cannot be set.