#' wrapper of downloadButton to suppress btn-default
#'
#' @param ... parameters of downloadButton
#' @import shiny
#' @import htmltools
#' @return a download button without btn-default
#' @export
dwld_button_app <- function(...){
button <- htmltools::tagQuery(shiny::downloadButton(...))$
removeClass("btn-default")$
allTags()
}
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