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Title relating to tag

It appears the page's title's is made up of someTag, dash, question title, but what tag is someTag? This question has three tags, yet it shows the singlepage tag out of all three, so what is the tag that appears in the page's title and why?

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marked as duplicate by Ilmari Karonen, Doorhandle, animuson Feb 24 '14 at 22:50

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I think it's the first tag that isn't already in the title. – Mysticial Feb 24 '14 at 22:44
Voted to close my own question :) – Doorhandle Feb 24 '14 at 22:50
up vote 4 down vote accepted

The first or second top tag (sorted by popularity) not already in the title is prepended. If both tags are already in the title, no tag is prepended at all.

For example, How to use eval instead if else in python has has python in the title, so the lone tag on the post doesn't make it into the title of the page.

In another example, python implement CLI in shell and telnet, both top tags are already in the title, the 3rd tag is not considered.

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What do you mean by first, first in chronological order? – Doorhandle Feb 24 '14 at 22:47
@TheWobbuffet: sorted by popularity of the tag at the time of last edit. If tag popularity has changed over time an edit could lead to a reordering of the tags shown on a post, and thus what tag ends up in the title. – Martijn Pieters Feb 24 '14 at 22:48
Oh okay (will accept when I can). – Doorhandle Feb 24 '14 at 22:49
sorry, didn't mean to accept a year later – Doorhandle Jul 22 '15 at 3:14

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