https://bugzilla.mozilla.org/show_bug.cgi?id=1002297
1002297 - MSE YouTube demo player doesn't seek into unbuffered range
RESOLVED (cajbir.bugzilla) in Core - Audio/Video. Last updated 2014-06-03.
youtube demomseplayer
https://gameranx.com/updates/id/21968/article/play-blades-of-excalibur-demo-on-youtube/
Play Blades of Excalibur Demo on YouTube - Gameranx
Feb 3, 2016 - It's not on an actual YouTube video, but it's pretty cool anyway.
on youtubeplaybladesexcaliburdemo
https://www.andrearigato.it/pf/vimeo-youtube-project/
Vimeo & Youtube Projects (Demo) - WordPress
Template for showcasing video projects
youtube projectsvimeodemowordpress