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Clash between footnote numbering of posts on the same page

If a post uses a Markdown footnote, and then another post on the same page also uses a footnote (such as a question and one of its answers, or 2 answers to the same question), the footnote link goes to the first footnote of that number on the page, rather than the the footnote of that number in the same post.

For example, if a question includes a footnote using `[^1]` and so does one of its answers, clicking the footnote link in the answer will take you to the footnote at the bottom of the question instead of the footnote at the bottom of the answer.

Similarly, clicking on the return link at the end of the footnote at the bottom of the answer will take you to the footnote link in the question rather than the footnote link in the answer.

One attempt to work around this problem might be to use different numbers for the footnotes in different posts. However, these are automatically renumbered when the Markdown is rendered, so even if you call the first footnote in a post `[^2]` it will be rendered as [^2].

I'll add an answer with a footnote so this can easily be seen on this page.

[^2]: In the raw Markdown this footnote is called `[^2]` (edit or suggest edit to see the raw Markdown, then cancel without editing), but it is rendered as a 1.