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#### 12.6.3 HTML preamble and postamble

The HTML exporter lets you define a preamble and a postamble.

The default value for `org-html-preamble` is `t`, which means that the preamble is inserted depending on the relevant format string in `org-html-preamble-format`.

Setting `org-html-preamble` to a string will override the default format string. If you set it to a function, it will insert the output of the function, which must be a string. Setting to `nil` will not insert any preamble.

The default value for `org-html-postamble` is `'auto`, which means that the HTML exporter will look for information about the author, the email, the creator and the date, and build the postamble from these values. Setting `org-html-postamble` to `t` will insert the postamble from the relevant format string found in `org-html-postamble-format`. Setting it to `nil` will not insert any postamble.