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HTML formatted text.
Take something HTML-like, for use as a formatted string.
::
# 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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Like `str.format`, but make sure that the arguments are properly
escaped.
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