Description
Describe the problem
When creating a multi-page Shiny application with page_navbar(), it seems that two <body> tags are generated.
This can be reproduced from the page_navbar() help page example:
library(shiny)
library(bslib)
link_shiny <- tags$a(
shiny::icon("github"), "Shiny",
href = "https://github.com/rstudio/shiny",
target = "_blank"
)
link_posit <- tags$a(
shiny::icon("r-project"), "Posit",
href = "https://posit.co",
target = "_blank"
)
ui <- page_navbar(
title = "My App",
nav_panel(title = "One", p("First page content.")),
nav_panel(title = "Two", p("Second page content.")),
nav_panel("Three", p("Third page content.")),
nav_spacer(),
nav_menu(
title = "Links",
align = "right",
nav_item(link_shiny),
nav_item(link_posit)
)
)
server <- function(...) { } # not used in this example
shinyApp(ui, server)The source code (as displayed by Firefox 138.0.3 on Ubuntu 24.04) presents two nested <body> tags:
<!DOCTYPE html>
<html>
<head>
...
</head>
<body>
<body class="bslib-page-fill bslib-gap-spacing bslib-flow-mobile html-fill-container bslib-page-navbar" style="padding:0px;gap:0px;">
...
</body>
</body>
</html>
Am I missing something?
Session Info
> devtools::session_info()
─ Session info ─
setting value
version R version 4.5.0 (2025-04-11)
os Ubuntu 24.04.2 LTS
system x86_64, linux-gnu
ui RStudio
language fr_FR:en_US:en
collate fr_FR.UTF-8
ctype fr_FR.UTF-8
tz Europe/Paris
date 2025-06-06
rstudio 2025.05.0+496 Mariposa Orchid (desktop)
pandoc 3.1.3 @ /usr/bin/pandoc
quarto 1.6.42 @ /usr/lib/rstudio/resources/app/bin/quarto/bin/quarto
─ Packages ─
package * version date (UTC) lib source
bslib * 0.9.0.9000 2025-06-06 [1] Github (rstudio/bslib@7cf8050)
cachem 1.1.0 2024-05-16 [1] CRAN (R 4.5.0)
cli 3.6.5 2025-04-23 [1] CRAN (R 4.5.0)
devtools 2.4.5 2022-10-11 [1] CRAN (R 4.5.0)
digest 0.6.37 2024-08-19 [1] CRAN (R 4.5.0)
ellipsis 0.3.2 2021-04-29 [1] CRAN (R 4.5.0)
fastmap 1.2.0 2024-05-15 [1] CRAN (R 4.5.0)
fontawesome 0.5.3 2024-11-16 [1] CRAN (R 4.5.0)
fs 1.6.6 2025-04-12 [1] CRAN (R 4.5.0)
glue 1.8.0 2024-09-30 [1] CRAN (R 4.5.0)
htmltools 0.5.8.1 2024-04-04 [1] CRAN (R 4.5.0)
htmlwidgets 1.6.4 2023-12-06 [1] CRAN (R 4.5.0)
httpuv 1.6.16 2025-04-16 [1] CRAN (R 4.5.0)
jquerylib 0.1.4 2021-04-26 [1] CRAN (R 4.5.0)
jsonlite 2.0.0 2025-03-27 [1] CRAN (R 4.5.0)
later 1.4.2 2025-04-08 [1] CRAN (R 4.5.0)
lifecycle 1.0.4 2023-11-07 [1] CRAN (R 4.5.0)
magrittr 2.0.3 2022-03-30 [1] CRAN (R 4.5.0)
memoise 2.0.1 2021-11-26 [1] CRAN (R 4.5.0)
mime 0.13 2025-03-17 [1] CRAN (R 4.5.0)
miniUI 0.1.2 2025-04-17 [1] CRAN (R 4.5.0)
pillar 1.10.2 2025-04-05 [1] CRAN (R 4.5.0)
pkgbuild 1.4.8 2025-05-26 [1] CRAN (R 4.5.0)
pkgconfig 2.0.3 2019-09-22 [1] CRAN (R 4.5.0)
pkgload 1.4.0 2024-06-28 [1] CRAN (R 4.5.0)
profvis 0.4.0 2024-09-20 [1] CRAN (R 4.5.0)
promises 1.3.3 2025-05-29 [1] CRAN (R 4.5.0)
purrr 1.0.4 2025-02-05 [1] CRAN (R 4.5.0)
R6 2.6.1 2025-02-15 [1] CRAN (R 4.5.0)
Rcpp 1.0.14 2025-01-12 [1] CRAN (R 4.5.0)
remotes 2.5.0 2024-03-17 [1] CRAN (R 4.5.0)
rlang 1.1.6 2025-04-11 [1] CRAN (R 4.5.0)
rstudioapi 0.17.1 2024-10-22 [1] CRAN (R 4.5.0)
sass 0.4.10 2025-04-11 [1] CRAN (R 4.5.0)
sessioninfo 1.2.3 2025-02-05 [1] CRAN (R 4.5.0)
shiny * 1.10.0 2024-12-14 [1] CRAN (R 4.5.0)
tibble 3.2.1 2023-03-20 [1] CRAN (R 4.5.0)
urlchecker 1.0.1 2021-11-30 [1] CRAN (R 4.5.0)
usethis 3.1.0 2024-11-26 [1] CRAN (R 4.5.0)
vctrs 0.6.5 2023-12-01 [1] CRAN (R 4.5.0)
xtable 1.8-4 2019-04-21 [1] CRAN (R 4.5.0)
[1] xxx
[2] /usr/local/lib/R/site-library
[3] /usr/lib/R/site-library
[4] /usr/lib/R/library
── Packages attached to the search path. here