querySelector vs getElementById

Get Element By Id

• It returns a node list which is live, meaning if you add or remove any element from the DOM the node list will update
• It is faster relative to the query selector methods

Query Selector

• It returns a node list which was available at the time of the execution

Also Read:

1. imperative vs declarative/functional programming
2. position: relative
3. Applying floats and clearfix to block elements
4. Getting started with localStorage vs sessionStorage in html5
5. Getting the parameters and arguments of a javascript function