This page shows some of the markup variables that are available from the engine:

%%(ascitime)s = %(asctime)s
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%%(login_form)s = %(login_form)s
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%%(message)s = %(message)s
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%%(title)s = %(title)s
----
%%(site_title)s = %(site_title)s
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%%(content_type)s = %(content_type)s
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%%(cookies)s = %(cookies)s
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%%(base_url)s = %(base_url)s
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%%(base_css_url) = %(base_css_url)s
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%%(stylesheet) = %(stylesheet)s
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%%(body_attrs) = %(body_attrs)s
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%%(page_url) = %(page_url)s
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%%(user_name) = %(user_name)s
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%%(user_id) = %(user_id)s
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%%(user_admin) = %(user_admin)s
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%%(theme) = %(theme)s
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%%(version) = %(version)s