Hi,
In HTML documents, setting the `apperance="minimal"` or `icon=false` attribute on a callout does not suppress the icon when the callout doesn't contain a header. Same goes for setting `callout-appearance: minimal` or `callout-icon: false` in the global options. This issue does not occur in PDF documents. 

Reprex:

```
---
title: "Callout Icons"
format: html
---

::: {.callout-warning appearance="minimal"}

This is a callout without a heading. 

The icon is not suppressed.

:::

::: {.callout-warning appearance="minimal"}

# This callout has a heading. 

The icon is suppressed as expected.

:::
```

<details>
<summary>Session Info</summary>

```
R version 4.2.0 (2022-04-22 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19044), RStudio 2022.2.0.443

Locale:
  LC_COLLATE=English_United States.utf8 
  LC_CTYPE=English_United States.utf8   
  LC_MONETARY=English_United States.utf8
  LC_NUMERIC=C                          
  LC_TIME=English_United States.utf8    

Package version:
  base64enc_0.1.3 bslib_0.3.1     cli_3.3.0       compiler_4.2.0 
  digest_0.6.29   evaluate_0.15   fastmap_1.1.0   fs_1.5.2       
  glue_1.6.2      graphics_4.2.0  grDevices_4.2.0 highr_0.9      
  htmltools_0.5.2 jquerylib_0.1.4 jsonlite_1.8.0  knitr_1.39     
  later_1.3.0     magrittr_2.0.3  methods_4.2.0   processx_3.5.3 
  ps_1.7.0        quarto_1.1      R6_2.5.1        rappdirs_0.3.3 
  Rcpp_1.0.8.3    rlang_1.0.2     rmarkdown_2.14  rstudioapi_0.13
  sass_0.4.1      stats_4.2.0     stringi_1.7.6   stringr_1.4.0  
  tinytex_0.39    tools_4.2.0     utils_4.2.0     xfun_0.31      
  yaml_2.3.5  
```
</details>
<details>
<summary>Quarto Check</summary>

I'm not sure why the check could not locate R. I can run R code chunks in Quarto documents just fine.

```

[>] Checking Quarto installation......OK
      Version: 0.9.510
      Path: C:\Users\czippel\AppData\Local\Programs\Quarto\bin\
      CodePage: 1252

[>] Checking basic markdown render....OK

[>] Checking Python 3 installation....OK
      Version: 3.9.11 (Conda)
      Path: C:/Users/czippel/Anaconda3/python.exe
      Jupyter: 4.9.2
      Kernels: python3

[>] Checking Jupyter engine render....OK

[>] Checking R installation...........(None)

      Unable to locate an installed version of R.
      Install R from https://cloud.r-project.org/

```
</details>

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dragonstyle
2022-06-06T14:55:47Z
c-zippel
verify-fixed
closed
Callout icons can't be suppressed in callouts without headings in HTML docs
https://github.com/quarto-dev/quarto-cli/issues/1078