Answer 1

These are the values of target attribute which is used how to target the linked document.
This is the syntax for target attribute :
<a href="https://www.google.com/" target="_blank">Google</a>
1) _parent = It will open the document in parent window.
2) _top = It will open the document in full broser window.
3) _blank = It will open the document in new tab window.
I hope it will help you.