xaringan | R package for creating slideshows

If I print a tibble with the console in the RStudio IDE the NA values appear in red. When I print the table on a xaringan slide the table is black and white and the NA_character_ values display as . Is there a way to get the output on a xaringan slide to look like the console output (without using a screen shot)?

Here is an example:

Take the following minimal example. The numbering of the list restarts to 1 in slide 2, when I wanted that the list of slide 2 started with 2. I tried, after intensive Google search, a suggestion given at R Markdown Presentation: How to continue a numbered list across a slide? (see slide 3 and slide 4, below), but with no luck. Thanks!

When using Bookdown (HTML output), the following works perfectly:

When I include an image in a xaringan deck using knitr::include_graphics(), my page break operator (---) fails, and the next slide merges into the previous slide.

Here is a reprex demonstrating the problem:

I know I can set a countdown for each slide with

I have created one function that contains two types of plots and it will give you one image. However, the title of this image will change depending on one list, so, you will have several plots but different title. (The original function will change the numbers that the plot uses but, in essence, is what I need).

This is the example that I have created.

I am making a xaringan presentation and I am trying to show my chunk options in R Markdown, and I need that it appears in a gray square.

Like this image:

But I just get my code without that nice gray square:

And of course I don't know how to put the highlights in this kind of code chunks. If somebody knows how to do it, I will really appreciate it.

This is the code I wrote in order to get the chunk without the square:

I would like to include a red border to the first xaringan slide:

This is my Rmd code:

I find that PNG/JPEG images in Xaringan (xaringan::moon_reader()) html slides are visually soft and fuzzy compared to SVGs. See sample screenshots below.

In contrast, these three formats are visually comparable in standard html report (rmarkdown::html_document()). See screenshot below.

The obvious solution was to use SVG. But, SVGs explode in size for complex figures. So, it's a bit risky to use as default in a template.

This image below for example, is 7MB as SVG while the corresponding PNG is 50kB. Having many such SVG figures can lead to the final document being hundreds of MBs in size.

Using an online tool (https://vecta.io/nano), I was able to bring the 7MB SVG down to 1.6MB (>75% reduction). Huge difference in size without obvious visual change in quality. Still far from PNG sizes.

So, some of my questions are:

• Why is the PNG quality bad in xaringan? What can be done to improve it?

• Are there tools/devices in R that can decrease SVG size? (simplify/flatten paths?)

• Other thoughts/suggestions?

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