Sometimes, I'll see a site whose design I really like and I wonder if it's WordPress or a static site (getting hard to tell just by looking nowadays!).
If I view on the source code for the page and see something like this:
<p style="text-align: center;"><small>embedded by wordpress.org/extend/plugins/embedded-video-with-link/" title="plugin page">Embedded Video</small>
.... <snip> <!-- generated by WordPress plugin Embedded Video -->
does that pretty much tell me definitively that it is a WordPress site?
You can't run a WordPress plugin on a non-Wordpress site, right?