Some golfers will use functions such as
console.log (explicit printing), whereas other golfers will rely on the console implicitly logging the return value of statements executed in it (implicit printing).
I think it's worth discussing what the standard should be so that developers who make use of explicit printing are not at a disadvantage against developers using implicit printing. Of course, anyone posting a code golf could always explicitly override the standard.
<script> element, browser console, node, etc), which means that explicit printing would be required.
* some golfs will require exceptions to this due to the nature of the different environments