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Q&A Why do tags URL contain the ID of the site?

They don't. Linguistics is one site. Its site ID is 12. It has three categories - Q&A, Meta, and Resources - with IDs respectively of 36, 37, and 40. Each category has a tag set, which contai...

posted 4y ago by ArtOfCode‭

Answer
#1: Initial revision by user avatar ArtOfCode‭ · 2020-11-02T14:37:01Z (about 4 years ago)
They don't.

Linguistics is one site. Its site ID is 12. It has three _categories_ - Q&A, Meta, and Resources - with IDs respectively of 36, 37, and 40.

Each category has a _tag set_, which contains tags used in that category; tag sets can be shared across multiple categories. The tags page URL starts with `/categories/37` because it's looking up tags _for that category_ (or, technically, within that category's tag set).

Parent and child tags are no different to each other; they're both fully-qualified top-level tags, just that they're related to one another - hence, the URL is no different other than the ID.