When a page defines a canonical URL via the "<link rel=canonical>" HTML element that differs from the page's actual URL, Safari will never mark that page as visited. For example, if the page "https://example.com/mypage.html?hello=world" defines its canonical URL as "https://example.com/mypage.html", a link to the former will never be marked as visited. I'm not sure how much overlap there is with https://bugs.webkit.org/show_bug.cgi?id=78358
<rdar://problem/104297079>