Output function for using markmap within Shiny applications and interactive Rmd documents. This function is taken from https://github.com/seifer08ms/Rmarkmap.
markmapOutput(outputId, width = "100%", height = "400px")
output variable to read from
Must be a valid CSS unit (like '100%'
, '400px'
, 'auto'
) or a number, which will be coerced to a string and have 'px'
appended.
See 'width'.