在独立的 R Markdown 中渲染 CDN fontawesome 图标

我正在try 在Rmarkdown 文档中添加字体很棒的图标，并将其呈现到HTML文件中.我在页脚中包含了字体Awesome CDN CSS链接，并使用includes参数将其包含在文档中.当self_contained YAML参数设置为false时，图标可能会显示.

但是，当self_contained设置为true时，图标不会显示.

Rendered HTML document with self_contained: false

Rendered HTML document with self_contained: true

示例文档

Rmarkdown

---
title: "Test for fontawesome icon"
output:
  html_document:
    self_contained: true
    includes:
      after_body: samplefooter.html
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = FALSE, message = FALSE, warning = FALSE)
```

Testing whether fontawesome icons could be shown

<!-- solid style -->
<i class="fas fa-user"></i>

<!-- regular style -->
<i class="far fa-user"></i>

<!--brand icon-->
<i class="fab fa-github-square"></i>

HTML页脚(samplefooter.html)

<footer>
  <br>
  <!-- Add fa icon library -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/all.min.css" /> -->

  <hr />

  <p style="text-align: center;">
    <a href="" title="icon 1" class="fas fa-globe-asia"></a>
    <a href="" title="icon 2" class="fab fa-github"></a>
    <a href="" title="icon 3" class="fas fa-envelope"></a>
  </p>

  <br>
</footer>

Xfun::会话信息

R version 4.1.0 (2021-05-18)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS 12.3.1, RStudio 2022.2.3.492

Locale: en_US.UTF-8 / en_US.UTF-8 / en_US.UTF-8 / C / en_US.UTF-8 / en_US.UTF-8

Package version:
  askpass_1.1        base64enc_0.1.3    bslib_0.2.5.1      cachem_1.0.5       callr_3.7.0        cli_3.1.0          colorspace_2.0-2  
  commonmark_1.7     compiler_4.1.0     cpp11_0.4.2        crayon_1.4.2       curl_4.3.2         digest_0.6.29      ellipsis_0.3.2    
  evaluate_0.14      fansi_0.5.0        farver_2.1.0       fastmap_1.1.0      fs_1.5.0           fst_0.9.4          glue_1.5.1        
  graphics_4.1.0     grDevices_4.1.0    highr_0.9          htmltools_0.5.2    httpuv_1.6.1       httr_1.4.2         jquerylib_0.1.4   
  jsonlite_1.7.2     kableExtra_1.3.4   knitr_1.36         labeling_0.4.2     later_1.2.0        lifecycle_1.0.1    magrittr_2.0.1    
  methods_4.1.0      mime_0.12          munsell_0.5.0      openssl_1.4.5      packrat_0.7.0      parallel_4.1.0     pillar_1.6.4      
  pkgconfig_2.0.3    processx_3.5.2     promises_1.2.0.1   ps_1.6.0           R6_2.5.1           rappdirs_0.3.3     RColorBrewer_1.1.2
  Rcpp_1.0.7         rlang_0.4.12       Rmarkdown _2.14     rsconnect_0.8.25   rstudioapi_0.13    rvest_1.0.0        sass_0.4.0        
  scales_1.1.1       selectr_0.4.2      shiny_1.6.0        sourcetools_0.1.7  stats_4.1.0        stringi_1.7.5      stringr_1.4.0     
  svglite_2.0.0      sys_3.4            systemfonts_1.0.2  tibble_3.1.6       tinytex_0.32       tools_4.1.0        utf8_1.2.2        
  utils_4.1.0        vctrs_0.3.8        viridisLite_0.4.0  webshot_0.5.2      withr_2.4.3        xfun_0.31          xml2_1.3.2        
  xtable_1.8-4       yaml_2.2.1