title: How do you format the header of a table produced using the R DT (datatables) package
body: <p>The R package DT uses the datatables JavaScript library to draw nice-looking tables. I can determine the formatting of the cells in the table using the formatStyle() function, but there does not seem to be a function to format the column headers. Is there a way to format the headers of the table, for example fonts, alignments etc?</p>
  
  <p>Many questions about DT on Stack Overflow are specific to R Shiny, and I am not using R Shiny.</p>