Hello! I am running into trouble displaying side-by-side htmlwidgets (e.g. leaflet maps, ggiraph plots, highcharter) in quarto, but only when trying to include a caption for each figure. I leave below an example using leaflet, with my session info in case it helps.
Thanks in advance for any help 
Session info
- Session info ---------------------------------------------------------------
setting value
version R version 4.1.0 (2021-05-18)
os Windows 10 x64
system x86_64, mingw32
ui RTerm
language (EN)
collate French_France.1252
ctype French_France.1252
tz Europe/Paris
date 2022-08-09
- Packages -------------------------------------------------------------------
package * version date lib source
cli 3.0.0 2021-06-30 [1] CRAN (R 4.1.0)
crosstalk 1.1.1 2021-01-12 [1] CRAN (R 4.1.0)
digest 0.6.27 2020-10-24 [1] CRAN (R 4.1.0)
evaluate 0.15 2022-02-18 [1] CRAN (R 4.1.3)
htmltools 0.5.1.1 2021-01-22 [1] CRAN (R 4.1.0)
htmlwidgets 1.5.3 2020-12-10 [1] CRAN (R 4.1.0)
jsonlite 1.8.0 2022-02-22 [1] CRAN (R 4.1.3)
knitr 1.39 2022-04-26 [1] CRAN (R 4.1.3)
leaflet * 2.0.4.1 2021-01-07 [1] CRAN (R 4.1.0)
magrittr 2.0.1 2020-11-17 [1] CRAN (R 4.1.0)
R6 2.5.1 2021-08-19 [1] CRAN (R 4.1.3)
rlang 1.0.2 2022-03-04 [1] CRAN (R 4.1.3)
rmarkdown 2.14 2022-04-25 [1] CRAN (R 4.1.0)
sessioninfo 1.1.1 2018-11-05 [1] CRAN (R 4.1.0)
stringi 1.6.2 2021-05-17 [1] CRAN (R 4.1.0)
stringr 1.4.0 2019-02-10 [1] CRAN (R 4.1.0)
withr 2.4.2 2021-04-18 [1] CRAN (R 4.1.0)
xfun 0.31 2022-05-10 [1] CRAN (R 4.1.3)
yaml 2.2.1 2020-02-01 [1] CRAN (R 4.1.0)
[1] C:/R/win-library/4.1
[2] C:/R/R-4.1.0/library
---
title: "Side-by-side widgets with figure captions"
format: html
editor: source
---
```{r}
library(leaflet)
map <- leaflet() %>%
addTiles() %>% # Add default OpenStreetMap map tiles
addMarkers(lng=174.768, lat=-36.852, popup="The birthplace of R")
```
One HTML widget, with figure caption
```{r}
#| fig-cap: "No problem with this caption"
map
```
Two HTML widgets, without figure caption
```{r}
#| layout-ncol: 2
map
map
```
Two HTML widgets, with two figure captions
```{r}
#| layout-ncol: 2
#| fig-cap:
#| - First caption
#| - Second caption
map
map
```
````