Web pages are an extremely useful format for many different purposes. If possible, I think it's best to stick to the most widely used standards.
This format may be UTF-8 encoded, Strict XHTML 1.1 with CSS1. The file may contain an American English (en-US) web page, valid in the strict XHTML 1.1 language, encoded in UTF-8. It may also contain a fun visual style for the page, in the CSS1 language.
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