You can, but it's not always respected by the user's device. Mobile devices will usually respect it but desktop browsers will often ignore it and start the video from the beginning.
>desktop browsers will often ignore it and start the video from the beginning.
Is there some data on this, or are you just making it up? It's long been a feature on one of the largest internet sites. I've never not had it work on the desktop, at least on Firefox, Brave, and Chromium on both Mac and Linux.
Many websites use handlers for YouTube links in their comments/messages section that treat it differently that just a hyperlink. For example, if you post a plain YouTube URL to Imgur and someone clicks on it, it won't take them to YouTube.com. It'll open a small pop-up player that strip out any modifiers like the timecode and plays the video from the start. I've also run into this problem trying to share videos with subtitles enabled by default.
For what it's worth, I've had it happen a few times and I use Firefox on a PC. I suspect it's probably more to do with linking variables after the url proper from certain sites, rather than a browser-level complaint.
