texinfo: @emph @strong

Emphasis

Smallcaps

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9.2.1 '@emph'{TEXT} and '@strong'{TEXT}
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The '@emph' and '@strong' commands are for emphasis; '@strong' is
stronger.  In printed output, '@emph' produces _italics_ and '@strong'
produces *bold*.  In the Info output, '@emph' surrounds the text with
underscores ('_'), and '@strong' puts asterisks around the text.

  For example,

     @strong{Caution:} @samp{rm *}
     removes @emph{all} normal files.

produces the following:

     *Caution*: 'rm * .[^.]*' removes _all_ normal files.

  The '@strong' command is seldom used except to mark what is, in
effect, a typographical element, such as the word 'Caution' in the
preceding example.

     Caution: Do not use '@strong' with the word 'Note' followed by a
     space; Info will mistake the combination for a cross reference.
     Use a phrase such as *Please notice* or *Caution* instead, or the
     optional argument to '@quotation'--'Note' is allowable there.