Usually used along with card,
card2, and card_tabset. See tools
parameters in these functions accordingly.
Details
When badge is NULL or empty, then as_badge
returns empty strings. When badge is a "shiny.tag" object,
then 'HTML' class 'right' and 'badge' will be appended.
When badge is a string, it should follow the syntax of
"message|class". The text before "|" will be the badge
message, and the text after the "|" becomes the class string.