Clicking "Random article" on Wikipedia repeatedly doesn't add history entries -- if you use the back button, it doesn't go back to the last one that was loaded. Apparently Chrome/Blink used to have the same issue, but it has since been fixed. See <https://phabricator.wikimedia.org/T39224> for the Wikipedia bug about this. This may be the same bug as <https://bugs.webkit.org/show_bug.cgi?id=19422>.
<rdar://problem/109707703>
Prior reports of this were duped to bug 19422.