What does "stylesheet" mean?

A document issued by a publisher informing authors how to style their works for publication; a small style guide.

Stylesheet

/ˈstaɪlʃiːt/ noun

noun ·Rare ·Advanced level

Noun

1
A document issued by a publisher informing authors how to style their works for publication; a small style guide.
2
A document consisting of markup that describes the layout and presentation to be used when displaying other documents.

From style + sheet.

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