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HTML formatted text.
Take something HTML-like, for use as a formatted string.
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# Turn something into red.
HTML('')
# Italic, bold, underline and strike.
HTML('...')
HTML('...')
HTML('...')
HTML('...')
All HTML elements become available as a "class" in the style sheet.
E.g. ``...`` can be styled, by setting a style for
``username``.
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