diff --git a/R/facets.R b/R/facets.R
index ed09a81..7e012a4 100644
--- a/R/facets.R
+++ b/R/facets.R
@@ -33,8 +33,8 @@ build_facets <- function(chart) {
       }
       mapdata <- lapply(chart$x$mapping, eval_tidy, data = facet)
       new$x$ax_opts$series <- make_series(mapdata, chart$x$mapping, chart$x$type, chart$x$serie_name)
-      new$x$facet <- NULL
       new$height <- chart$x$facet$chart_height
+      new$x$facet <- NULL
       class(new) <- setdiff(class(new), "apex_facet")
       return(new)
     }
@@ -68,13 +68,6 @@ build_grid <- function(content, nrow = NULL, ncol = NULL, col_gap = "0px", row_g
 }
 
 
-#' @export
-print.apex_facet <- function(x, ...) {
-  facets_charts <- build_facets(x)
-  TAG <- build_grid(facets_charts, nrow = x$x$facet$nrow, ncol = x$x$facet$ncol)
-  print(htmltools::browsable(TAG))
-}
-
 
 #' Facet wrap for ApexCharts
 #'
@@ -106,3 +99,31 @@ ax_facet_wrap <- function(ax,
   return(ax)
 }
 
+
+
+
+
+
+
+
+
+# Print methods -----------------------------------------------------------
+
+#' @export
+print.apex_facet <- function(x, ...) {
+  facets_charts <- build_facets(x)
+  TAG <- build_grid(facets_charts, nrow = x$x$facet$nrow, ncol = x$x$facet$ncol)
+  print(htmltools::browsable(TAG))
+}
+
+knit_print.apex_facet <- function(x, ..., options = NULL) {
+  facets_charts <- build_facets(x)
+  TAG <- build_grid(facets_charts, nrow = x$x$facet$nrow, ncol = x$x$facet$ncol)
+  knitr::knit_print(htmltools::browsable(TAG), options = options, ...)
+}
+
+
+
+
+
+
diff --git a/R/onLoad.R b/R/onLoad.R
index 62f8c9e..0352089 100644
--- a/R/onLoad.R
+++ b/R/onLoad.R
@@ -35,4 +35,5 @@
       }
     }
   }, force = TRUE)
+  register_s3_method("knitr", "knit_print", "apex_facet")
 }
diff --git a/R/utils.R b/R/utils.R
index 497cd56..c8ce5c1 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -100,4 +100,29 @@ to_posix <- function(x) {
 
 
 
+# From vignette('knit_print', package = 'knitr')
+# and https://github.com/rstudio/htmltools/pull/108/files
 
+register_s3_method <- function(pkg, generic, class, fun = NULL) { # nocov start
+  stopifnot(is.character(pkg), length(pkg) == 1)
+  stopifnot(is.character(generic), length(generic) == 1)
+  stopifnot(is.character(class), length(class) == 1)
+  
+  if (is.null(fun)) {
+    fun <- get(paste0(generic, ".", class), envir = parent.frame())
+  } else {
+    stopifnot(is.function(fun))
+  }
+  
+  if (pkg %in% loadedNamespaces()) {
+    registerS3method(generic, class, fun, envir = asNamespace(pkg))
+  }
+  
+  # Always register hook in case package is later unloaded & reloaded
+  setHook(
+    packageEvent(pkg, "onLoad"),
+    function(...) {
+      registerS3method(generic, class, fun, envir = asNamespace(pkg))
+    }
+  )
+} # nocov end