我使用webshot包和phantomjs自动截取html表格的屏幕截图并将屏幕截图包含在呈现的文档中（例如GitHub README文档）时从未遇到过问题。有关参考，请参见：https://bookdown.org/yihui/rmarkdown-cookbook/html-widgets.html
HTML widget（https://www.htmlwidgets.org）是典型的交互式JavaScript应用程序，只能在HTML输出中工作。如果您将包含HTML小部件的Rmd文档编织为非HTML格式（如PDF或Word），则可能会收到如下错误消息：
Error: Functions that produce HTML output found in document targeting X output. Please change the output type of this document to HTML. Alternatively, you can allow HTML output in non-HTML formats by adding this option to the YAML front-matter of your rmarkdown file:
always_allow_html: yes
Note however that the HTML output will not be visible in non-HTML formats.
实际上有一个比上述错误消息中提到的更好的解决方案，但它涉及额外的包。你可以在R中安装webshot包（Chang 2022），也可以安装PhantomJS：
install.packages("webshot")
webshot::install_phantomjs()
然后，如果您将带有HTML小部件的Rmd文档编织成非HTML格式，则HTML小部件将显示为静态屏幕截图。屏幕截图是在knitr中自动拍摄的。
然而，几个月前，它停止了对来自flextable包的对象的工作，然而，它仍然适用于其他html对象，如DT表。flextable作者不确定这种行为变化的原因，它可能与flextable包无关。我想知道是否有其他人可以复制，也许，指出一个解决方案。谢谢
以下是我的一个reprex尝试：

---
output:
  github_document
---

```{r versions}
packageVersion("webshot")
## [1] '0.5.4'

packageVersion("webshot2")
## [1] '0.1.0'

packageVersion("flextable")
## [1] '0.9.2.2'

webshot::is_phantomjs_installed()
## [1] TRUE

webshot::install_phantomjs()
## It seems that the version of `phantomjs` installed is greater than or equal to the 
requested version.To install the requested version or downgrade to another version, use 
`force = TRUE`.

webshot::install_phantomjs(force = TRUE)
## Warning in utils::download.file(url, method = method, ...): the 'wininet'
## method is deprecated for http:// and https:// URLs

## phantomjs has been installed to C:\Users\rempsyc\AppData\Roaming\PhantomJS

DT::datatable(head(iris))

![](https://i.stack.imgur.com/Vo5rG.png)

flextable::flextable(head(iris))

Error: Functions that produce HTML output found in document targeting 
gfm+tex_math_dollars-yaml_metadata_block output.
Please change the output type of this document to HTML.
If your aiming to have some HTML widgets shown in non-HTML format as a screenshot,
please install webshot or webshot2 R package for knitr to do the screenshot.
Alternatively, you can allow HTML output in non-HTML formats
by adding this option to the YAML front-matter of
your rmarkdown file:

  always_allow_html: true

Note however that the HTML output will not be visible in non-HTML formats.