People talking about Safari on the Apple Vision One not properly handling :hover (to prevent sites and apps from measuring where you're looking for nefarious purposes) reminds me of the time I discovered I could make a page with a bunch of links on it and query the color of each link to figure out which sites your visitor uses. I didn't have a use for this, but was briefly disappointed when that hole eventually got patched. Basically right away I was like "yeah, I'm glad they fixed this."