CSS to automatically add a filetype to the end of a link. (e.g. "[PDF]") This is a best practice for accessibility and usability. Add or remove types as you see fit.

append-file-types.css

/* ID Link Mimetypes for Common Filetypes */
a[href$=".doc"]::after {
  content: " [DOC]";
}
a[href$=".docx"]::after {
  content: " [DOCX]";
}

a[href$=".rtf"]::after {
  content: " [RTF]";
}

a[href$=".pdf"]::after {
  content: " [PDF]";
}

a[href$=".xls"]::after {
  content: " [XLS]";
}
a[href$=".xlsx"]::after {
  content: " [XLSX]";
}

a[href$=".csv"]::after {
  content: " [CSV]";
}