Markdown horizontal line
Three or more dashes on a line of their own draw a horizontal rule. Asterisks and underscores do the same.
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___What usually goes wrong
- Dashes directly under a line of text turn that text into a heading instead of drawing a rule. Leave a blank line between them.
- Three dashes at the very top of a file open YAML front matter, not a rule.
- Spaces between the characters are allowed (
- - -), which occasionally explains a rule you did not expect.