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Github wiki in showing old versions

Is there a way to view old historic revisions of wiki on github?

Here it says,

You can access the old rendered version, but not the source

But I found I can access neither the old rendered version, nor the source via github web.

UPDATE/Conclusion:

Thanks to VonC's answer, it turns out that GH might have disabled such feature in new repo/wiki --

  • This is a wiki history from one of my old repo
    enter image description here

  • This is a wiki history from my brand new repo created several days ago
    enter image description here
    The mouse is over SHA-1 hash but there is no link there.

Solution

  • The Wiki documentation has a "Viewing previous content" section:

    On the wiki history table, you can click a SHA-1 hash (the sequence of letters and numbers to the far right) to see a wiki page as it existed at a particular point in time.

    https://docs.github.com/assets/images/help/wiki/wiki_sha_number.png

    This is after clicking on the revisions of a wiki page.

    So you can access past rendered content that way.