Anchor in HTML

Just a note of different anchors as following:

1. href=’#’ will function the same as scroll to the top. This just draw me another attention that DO NOT put # in you file name!
2. href=’?’ will trigger the browser to refresh the same page. just a shorter coding if you don’t want to type the whole url.
3. href=’javascript:void(0)’ will do nothing. the same meaning as href=’javascript: return false;’.