Here’s what the CA Drivers’ Handbook says:
Respect the right-of-way of pedestrians. Always stop for any pedestrian crossing at corners or other crosswalks, even if the crosswalk is in the middle of the block and at corners with or without traffic lights, whether or not the crosswalks are marked by painted lines.
California Vehicle Code:
http://www.leginfo.ca.gov/cgi-bin/displaycode?section=veh&group=21001-22000&file=21949-2197121950. (a) The driver of a vehicle shall yield the right-of-way to
a pedestrian crossing the roadway within any marked crosswalk or
within any unmarked crosswalk at an intersection, except as otherwise
provided in this chapter.
(b) This section does not relieve a pedestrian from the duty of
using due care for his or her safety. No pedestrian may suddenly
leave a curb or other place of safety and walk or run into the path
of a vehicle that is so close as to constitute an immediate hazard.
No pedestrian may unnecessarily stop or delay traffic while in a
marked or unmarked crosswalk.
(c) The driver of a vehicle approaching a pedestrian within any
marked or unmarked crosswalk shall exercise all due care and shall
reduce the speed of the vehicle or take any other action relating to
the operation of the vehicle as necessary to safeguard the safety of
the pedestrian.
(d) Subdivision (b) does not relieve a driver of a vehicle from
the duty of exercising due care for the safety of any pedestrian
within any marked crosswalk or within any unmarked crosswalk at an
intersection.