How is the viewing made to convenience?

Something special and well thought from this website is that the links are being TAB in a single web page.

It looks like this:

Whenever you open a link within this website, it automatic open a tab within their own website. This make the website easier to view, reduce the number of windows open and for convenience sake.

A closer view:

And there is more, in addition to the function above, the Tabs can be closed and minimise. [ The red circle]

Not forgetting the neat view of minimise Tabs:

It is a well-planned website, in reference to this website functions, i learn that convenience in a website is important which i should apply it in my own web.