From the time, a blog was only a collection of posts, posts will have tags displayed at the bottom of the post.
The only page: a start collection of posts, ofcourse without tags itself.
In the meantime a blog has and posts and can have a lot of pages.
And there are plugins to add tags to pages.
Now the display of those relevant tags on a page.
Your plugin serves a display by shortcode or widget, of tags linked to posts.
I have 50% posts and 50% pages,together 600; therefore the question : make it possible for pages too.
Example :
having a page, holding the chess games of 2015, where chess players are described in posts. In both cases tag ( next to other ) = chessRussia.
Would be nice to collect them.
Regards