Renders a text span as underlined in the final output. Use inside glue-string expressions. Underline is less common in regulatory tables but is sometimes used for:
Confidentiality marks: "CONFIDENTIAL" in title headers.
Hyperlink-style emphasis in electronic submissions.
For most emphasis needs, prefer fr_bold() — it is the standard in
pharma TFL outputs.
Value
An fr_markup object. When interpolated inside a glue string,
produces a sentinel token resolved at render time.
Rendering
In RTF output, underline uses \ul ... \ulnone control words. In
future LaTeX output, it maps to \underline{}.
See also
fr_bold() for bold, fr_italic() for italic.
Examples
# Confidentiality marker
fr_underline("CONFIDENTIAL")
#> <fr_markup> __CONFIDENTIAL__
# In a title:
spec <- tbl_demog |> fr_table()
spec |> fr_titles("{fr_underline('CONFIDENTIAL')} - Do Not Distribute")
#>
#> ── fr_spec: Table
#> Data: 28 rows x 6 columns
#> Page: landscape letter, 9pt Courier New
#> Titles (1):
#> 1. [center] "CONFIDENTIAL - Do Not Distribute"
#> Header: valign=bottom