Answer by Martijn Pieters for Why are different tags shown on the tab for...
The first tag (sorted by popularity) is prepended, provided it isn't already present in the title itself.Also see Should questions include "tags" in their titles? on Meta.SE:Note that the system...
View ArticleWhy are different tags shown on the tab for different questions having more...
Consider Questions A,B,C and D.All of them are tagged with more than one tag.When I open each one of them,I see one of the tags on the respective tabs (see the screenshot in which tags are circled in...
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