By the way how do you vote the reversal? Is it only available to moderators?
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closed as off-topic by CRABOLO, Martijn Pieters, Shadow Wizard, Aziz Shaikh, nicael Dec 9 '14 at 14:35
This question appears to be off-topic. The users who voted to close gave this specific reason:
I removed the synonym. Unfortunately the two tags had been merged at some point, and there's no way to reverse that. The css-expressions tag will have to be added manually to any question where it applies.