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@@ -345,12 +345,13 @@ CSS classes, then this prefix can be very useful."
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(defcustom org-export-html-preamble t
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"Non-nil means insert a preamble in HTML export.
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-When `t', insert a string as defined by the formatting string in
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-`org-export-html-preamble-format'. When set to a string, this
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-string overrides `org-export-html-preamble-format'. When set to
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-a function, apply this function and insert the returned string.
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-The function takes the property list of export options as its
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-only argument.
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+
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+When `t', insert a string as defined by one of the formatting
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+strings in `org-export-html-preamble-format'. When set to a
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+string, this string overrides `org-export-html-preamble-format'.
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+When set to a function, apply this function and insert the
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+returned string. The function takes the property list of export
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+options as its only argument.
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Setting :html-preamble in publishing projects will take
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precedence over this variable."
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