Yes you can, on both accounts and as long as your html contains NO Active Content.
-Active content is any form of non-standard text that’s in listing descriptions to provide additional functionality, such as videos, animations, or sound. Examples of active content include JavaScript, Flash, and plug-ins. Active content can cause listings to display slowly on the page and in some cases display incorrectly when viewing them on mobile devices.
To improve the shopping experience for everyone on eBay, we’ll block the use of active content starting in June 2017. We recommend removing active content from your listings now to help make sure they won't be affected.
Links to YouTube videos are OK. Hope this helps. Good Luck!
