add js to enable popover and hover message
diff --git a/R/print.R b/R/print.R
index 8ac5e2f..626c00d 100644
--- a/R/print.R
+++ b/R/print.R
@@ -2,7 +2,8 @@
 print.kableExtra <- function(x) {
   html_header <- htmltools::tags$head(
     rmarkdown::html_dependency_jquery(),
-    rmarkdown::html_dependency_bootstrap(theme = "simplex")
+    rmarkdown::html_dependency_bootstrap(theme = "simplex"),
+    html_dependency_kePrint()
   )
 
   html_table <- htmltools::HTML(as.character(x))
@@ -10,6 +11,13 @@
   htmltools::html_print(htmltools::tagList(html_header, html_table))
 }
 
+html_dependency_kePrint <- function() {
+  htmlDependency(name = "kePrint",
+                 version = "0.0.1",
+                 src = system.file("htmlwidgets/lib/kePrint-0.0.1",
+                                   package = "kableExtra"),
+                 script = "kePrint.js")
+}
 
 #' @export
 knit_print.kableExtra <- function(x) {
diff --git a/R/spec_tools.R b/R/spec_tools.R
index b1892b2..76fb7dd 100644
--- a/R/spec_tools.R
+++ b/R/spec_tools.R
@@ -95,7 +95,8 @@
 #'
 #' @export
 spec_tooltip <- function(title, position = "right") {
-  position <- match.arg(position, c("right", "bottom", "top", "left", "auto"))
+  position <- match.arg(position, c("right", "bottom", "top", "left", "auto"),
+                        several.ok = TRUE)
   tooltip_options <- paste(
     'data-toggle="tooltip"',
     paste0('data-placement="', position, '"'),