It's interesting how this site gets around the ``rel="noreferrer"`` added to the link from HN. The banner uses a :visited CSS attribute to selectively show/hide the banner client side if your browser has been to the URL https://news.ycombinator.com/item?id=36971867. With how many other browser history privacy leaks have been released lately using :visited hacks, I wonder how long it will be until browser vendors disable :visited support across domains entirely.