Listen Offline to prerecorded videos on a website?

Hi friends, I need to watch Offline a series of professional videos from a website I study with. I'll be in a place with no internet for a while so I wish to know how to use the "work offline" modality to do that. Can the browser "remember" videos in the same way it remembers visited page? I remember in the 90s / 2000s was possible to "save" pages to read Offline later on... Is that still possible? Thanks