Is there a keyboard shortcut in the web-interface for "mark all notifications as read?"

The keyboard-shortcuts listed when typing «?» seem spotty at best—j/k doesn't seem to do anything (which in turn doesn't give post-focus for fav/boost/mention/etc functions; alt+x shows the content-warning box; but doesn't un-show it, etc. Some of the work better in the Advanced view rather than the more simple timeline view, but still spotty.