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When writing GFM with footnotes, only footnotes that have anchor text that does NOT include the letter "w" get rendered. Anchors like "a", "hello", and "testing-this" will render properly; anchors like "w", "awesome", and "not-without-a-sense-of-humor" will not render properly.

The following text demonstrates the problem:

Footnotes are only recognised sometimes.¹

The problem seems to be when there's a w in the footnote anchor.[^w]

Anchors without w seem to render OK. It's just those with w that get ignored.² [^w2] ³ [^this-is-not-awesome] ⁴

Here's how that renders in Firefox on Linux:

Here's the text quoted, so you can see the source code:

Footnotes are only recognised sometimes.[^like-this]

The problem seems to be when there's a w in the footnote anchor.[^w]

Anchors without w seem to render OK. It's just those with w that get ignored.[^a] [^w2] [^a2] [^this-is-not-awesome] [^this-is-not-rad]

  [^like-this]: Like this.
  
  [^w]: This won't be rendered.
  
  [^a]: This will be rendered.
  
  [^w2]: This won't be rendered.
  
  [^a2]: This will be rendered.
  
  [^this-is-not-awesome]: This will not be rendered.
  
  [^this-is-not-rad]: This will be rendered.

1. Like this. ↩

2. This will be rendered. ↩

3. This will be rendered. ↩

4. This will be rendered. ↩