"Transclusion" is a word Ted Nelson made up to describe a thing that is both a quote and a hyperlink (or "jump link" if you have no friends) - you can think of it like individual DOM element import / export from external pages.
Usually we don't do that because it's only possible with iframes and those are scary (and atomic at page level).
You need Chrome 55+ or FireFox Beta at the moment. Complain to your state senator.
But hold my beer, imma transclude some stuff with WebComponents & HTML Imports!
Here's Thing One transcluded from this root thing:
And here's Thing Two transcluded from this root thing:
Wow, what neat cool fun things we can do with WebComponents!
Lookit the source code here.