For the last 10-20 minutes, the button in my watchlist to mark all listed pages as visited has disappeared (Windows XP, FF 39, vector skin, desktop). Also, the help text to explain the green markers' meaning is missing now.
Switching to monobook and clearing my cache didn't help. Error has been reproduced by another user - see https://en.wikipedia.org/wiki/Wikipedia:Village_pump_%28technical%29#Watchlist_button_.22Mark_all_as_visited.22_missing
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The English Wikipedia has a set of gadgets that fiddle with this. It might be a local issue.
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It works for me on other wikis. The buttons appears to be hidden with CSS on https://en.wikipedia.org/wiki/Special:Watchlist and nowhere else. Please raise this issue locally.
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Thanks for the information, this issue (and related flaws in the CSS handling) have been discussed at en-Wiki VPT locally as advised.