Add a class to shadow hosts

[RLesur]

Hi David,

In order to resolve rstudio/pagedown#216, it would be a great help if the shadow host elements get a class name:

flextable/R/html_str.R

Line 70 in ea039f3

"\n<div id=\"", uid[2], "\"></div>",

I'll submit a PR.

[davidgohel]

Hi Romain

No problem, do you need a specific class value or any value is OK?

@tvroylandt @RLesur I think it's a good idea to have shadow dom support if possible. Meanwhile, you can use knitr::opts_chunk$set(ft.shadow = FALSE) that is there for pagedown support.

[RLesur]

I wasn't aware of the ft.shadow option. Thanks a lot for the tip!

[tvroylandt]

Thanks David ! This is a really useful option !

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