I learned this trick from Chris Coyier was speaking at Event Apart Seattle 2017.
It's a common practice to set the anchor element's href to
#, when you don't want anything to happen when user click on the link.
<a href="#">Click here</a>
However, some browsers may jump (usually to the top of the page), when users click on it.
So, here is a cool trick...use
<a href="#0">Click here</a>
Since IDs almost never start with a 0, it just safely fails and do nothing...which is the desired behavior.
But, here is the catch...
What Chris said was that an ID cannot start with a number in most cases. The exception that he gave was related to unicode (which I won't elaborate on).
After digging a little bit, it turn out that HTML4 specs prevent IDs from starting with a number.
BUT... HTML5 specs are cool with an ID starting with a number. BUT TO THE BUT... it's really not a common practice.
#0is just fine, and actually pretty cool. ;)
<a href="#!">Click here</a>
<a href="#void">Click here</a>