The video embed now does not work on two browsers - Firefox and Chrome - the open browsers!
See https://p2pu.org/en/courses/620/creative-commons-for-k-12-educators/ for an example.
The video shows up on Safari but not on both:
The problem is with embedding something with a URL that starts with http:// in a page server over https. You can fix the problem by changing http to https for the embedded URL or change http://so.me/url to ///so.me/url
I fixed the embed on the page you linked.
Thanks! I think that most people won’t know this, since they just copy and paste the embed code from video platforms. Do you think we could add this tip under a Video category in the Markdown cheatsheet? + @Erika