In article , Commander Kinsey
wrote:

The correct thing nowdays would be to have flash disabled, or have
setting to "always ask". And if asked, say "no" unless you really want
to see that box and trust the site.

Oh, Youtube changed to HTML5 4 years ago :-)
Surprising as I didn't think all browsers took up HTML5 for quite a while.

youtube started supporting html5 more than ten years ago, around when
the first iphone came out in 2007 and when browsers started to support
it.