which is better href="#" or href="javascript:void();" [duplicate]

This question already has an answer here:

• Which “href” value to use for JavaScript links: “#” or “javascript:void(0)”? 48 answers

which is better href="#" or href="javascript:void();" in terms of all aspects

like user experience, speed etc

is it necessary to put a 0 inside void when using href="javascript:void();" .like this href="javascript:void(0);"