Also of note is that in some regions it is apparently common to run the power to the fixture itself, then extend down to the switch. Which means there will always be hot wires at the fixture unless the circuit is shut off.
My experience with this comes from people who were from the southern US and who found it very weird and even at first insisted it was "wrong" to run the power to the switch then to the fixture. My theory on where this comes from is that this is a result of most homes in that area being built on slabs and so the power feeds are generally run through the ceiling. Whereas locally most buildings have basement/crawl spaces so the power feeds are generally in the floor then run up the wall to the switch and extend from there to the fixtures.
My experience with this comes from people who were from the southern US and who found it very weird and even at first insisted it was "wrong" to run the power to the switch then to the fixture. My theory on where this comes from is that this is a result of most homes in that area being built on slabs and so the power feeds are generally run through the ceiling. Whereas locally most buildings have basement/crawl spaces so the power feeds are generally in the floor then run up the wall to the switch and extend from there to the fixtures.