diff --git a/R/cell_spec.R b/R/cell_spec.R
index 8eb2c0f..c6ef41d 100644
--- a/R/cell_spec.R
+++ b/R/cell_spec.R
@@ -19,7 +19,8 @@
 #' `initial` and `inherit` while for LaTeX, you can only choose
 #' from `l`, `c` & `r`.
 #' @param font_size A numeric input for font size. For HTML, you can also use
-#' options
+#' options including `xx-small`, `x-small`, `small`, `medium`, `large`,
+#' `x-large`, `xx-large`, `smaller`, `larger`, `initial` and `inherit`.
 #' @param angle 0-360, degree that the text will rotate. Can be a vector.
 #' @param tooltip A vector of strings to be displayed as tooltip.
 #' Obviously, this feature is only available in HTML. Read the package
diff --git a/R/row_spec.R b/R/row_spec.R
index 877ab81..faa2465 100644
--- a/R/row_spec.R
+++ b/R/row_spec.R
@@ -19,8 +19,9 @@
 #' @param align A character string for cell alignment. For HTML, possible values could
 #' be `l`, `c`, `r` plus `left`, `center`, `right`, `justify`, `initial` and `inherit`
 #' while for LaTeX, you can only choose from `l`, `c` & `r`.
-#' @param font_size Only if you want to specify font size locally in HTML.
-#' This feature is not available in LaTeX
+#' @param font_size A numeric input for font size. For HTML, you can also use
+#' options including `xx-small`, `x-small`, `small`, `medium`, `large`,
+#' `x-large`, `xx-large`, `smaller`, `larger`, `initial` and `inherit`.
 #' @param angle 0-360, degree that the text will rotate.
 #'
 #' @examples x <- knitr::kable(head(mtcars), "html")
@@ -45,7 +46,7 @@
   }
   if (kable_format == "latex") {
     return(row_spec_latex(kable_input, row, bold, italic, monospace,
-                          color, background, align, angle))
+                          color, background, align, font_size, angle))
   }
 }
 
@@ -139,7 +140,7 @@
 }
 
 row_spec_latex <- function(kable_input, row, bold, italic, monospace,
-                           color, background, align, angle) {
+                           color, background, align, font_size, angle) {
   table_info <- magic_mirror(kable_input)
   out <- enc2utf8(as.character(kable_input))
 
@@ -153,7 +154,7 @@
   for (i in row) {
     target_row <- table_info$contents[i]
     new_row <- latex_new_row_builder(target_row, bold, italic, monospace,
-                                     color, background, align, angle)
+                                     color, background, align, font_size, angle)
     out <- sub(target_row, new_row, out, perl = T)
   }
 
@@ -163,7 +164,7 @@
 }
 
 latex_new_row_builder <- function(target_row, bold, italic, monospace,
-                                  color, background, align, angle) {
+                                  color, background, align, font_size, angle) {
   new_row <- latex_row_cells(target_row)
   if (bold) {
     new_row <- lapply(new_row, function(x) {
@@ -186,7 +187,12 @@
       paste0("\\\\textcolor", latex_color(color), "{", x, "}")
     })
   }
-
+  if (!is.null(font_size)) {
+    new_row <- lapply(new_row, function(x) {
+      paste0("\\\\begingroup\\\\fontsize{", font_size, "}{",
+             as.numeric(font_size) + 2,
+             "}\\\\selectfont ", x, "\\\\endgroup")})
+  }
   if (!is.null(align)) {
     new_row <- lapply(new_row, function(x) {
       paste0("\\\\multicolumn{1}{", align, "}{", x, "}")
diff --git a/docs/awesome_table_in_html.Rmd b/docs/awesome_table_in_html.Rmd
index 33c2297..fd5ee57 100644
--- a/docs/awesome_table_in_html.Rmd
+++ b/docs/awesome_table_in_html.Rmd
@@ -205,8 +205,8 @@
 ```{r}
 sometext <- strsplit(paste0(
   "You can even try to make some crazy things like this paragraph. ", 
-  "It seems to be a useless feature at this moment but who cares. ", 
-  "It is so fun to play with color that I can't stop. ;D"
+  "It seems to be a useless feature at this moment but it's so cool ",
+  "that nobody can resist. ;)"
 ), " ")[[1]]
 text_formatted <- paste(
   text_spec(sometext, "html", color = spec_color(1:length(sometext), end = 0.9),
@@ -271,6 +271,28 @@
 `text_spec("Hover on me", link = "javascript:void(0)", popover = "Hello")`:
 `r text_spec("Hover on me", link = "javascript:void(0)", popover = "Hello")`
 
+## Integration with `formattable` 
+You can combine the good parts from `kableExtra` & `formattable` together into one piece. Read more at http://haozhu233.github.io/kableExtra/use_kableExtra_with_formattable.html
+```{r, message = FALSE, warning=FALSE}
+library(formattable)
+mtcars[1:5, 1:4] %>%
+  mutate(
+    car = row.names(.),
+    mpg = color_tile("white", "orange")(mpg),
+    cyl = cell_spec(cyl, "html", angle = (1:5)*60, 
+                    background = "red", color = "white", align = "center"),
+    disp = ifelse(disp > 200,
+                  cell_spec(disp, "html", color = "red", bold = T),
+                  cell_spec(disp, "html", color = "green", italic = T)),
+    hp = color_bar("lightgreen")(hp)
+  ) %>%
+  select(car, everything()) %>%
+  kable("html", escape = F) %>%
+  kable_styling("hover", full_width = F) %>%
+  column_spec(5, width = "3cm") %>%
+  add_header_above(c(" ", "Hello" = 2, "World" = 2))
+```
+
 
 # Grouped Columns / Rows
 ## Add header rows to group columns
diff --git a/docs/awesome_table_in_html.html b/docs/awesome_table_in_html.html
index 5f4c0f2..3eb165e 100644
--- a/docs/awesome_table_in_html.html
+++ b/docs/awesome_table_in_html.html
@@ -2409,6 +2409,149 @@
 <h2>Links</h2>
 <p>You can add links to text via <code>text_spec(&quot;Google&quot;, link = &quot;https://google.com&quot;)</code>: <a href="https://google.com" style>Google</a>. If you want your hover message to be more obvious, it might be a good idea to put a <code>#</code> (go back to the top of the page) or <code>javascript:void(0)</code> (literally do nothing) in the <code>link</code> option. <code>text_spec(&quot;Hover on me&quot;, link = &quot;javascript:void(0)&quot;, popover = &quot;Hello&quot;)</code>: <a href="javascript:void(0)" style data-toggle="popover" data-trigger="hover" data-placement="right" data-content="Hello">Hover on me</a></p>
 </div>
+<div id="integration-with-formattable" class="section level2">
+<h2>Integration with <code>formattable</code></h2>
+<p>You can combine the good parts from <code>kableExtra</code> &amp; <code>formattable</code> together into one piece. Read more at <a href="http://haozhu233.github.io/kableExtra/use_kableExtra_with_formattable.html" class="uri">http://haozhu233.github.io/kableExtra/use_kableExtra_with_formattable.html</a></p>
+<pre class="r"><code>library(formattable)
+mtcars[1:5, 1:4] %&gt;%
+  mutate(
+    car = row.names(.),
+    mpg = color_tile(&quot;white&quot;, &quot;orange&quot;)(mpg),
+    cyl = cell_spec(cyl, &quot;html&quot;, angle = (1:5)*60, 
+                    background = &quot;red&quot;, color = &quot;white&quot;, align = &quot;center&quot;),
+    disp = ifelse(disp &gt; 200,
+                  cell_spec(disp, &quot;html&quot;, color = &quot;red&quot;, bold = T),
+                  cell_spec(disp, &quot;html&quot;, color = &quot;green&quot;, italic = T)),
+    hp = color_bar(&quot;lightgreen&quot;)(hp)
+  ) %&gt;%
+  select(car, everything()) %&gt;%
+  kable(&quot;html&quot;, escape = F) %&gt;%
+  kable_styling(&quot;hover&quot;, full_width = F) %&gt;%
+  column_spec(5, width = &quot;3cm&quot;) %&gt;%
+  add_header_above(c(&quot; &quot;, &quot;Hello&quot; = 2, &quot;World&quot; = 2))</code></pre>
+<table class="table table-hover" style="width: auto !important; margin-left: auto; margin-right: auto;">
+<thead>
+<tr>
+<th style="border-bottom:hidden">
+</th>
+<th style="text-align:center; border-bottom:hidden; padding-bottom:0; padding-left:3px;padding-right:3px;" colspan="2">
+<div style="border-bottom: 1px solid #ddd; padding-bottom: 5px;">
+Hello
+</div>
+</th>
+<th style="text-align:center; border-bottom:hidden; padding-bottom:0; padding-left:3px;padding-right:3px;" colspan="2">
+<div style="border-bottom: 1px solid #ddd; padding-bottom: 5px;">
+World
+</div>
+</th>
+</tr>
+<tr>
+<th style="text-align:left;">
+car
+</th>
+<th style="text-align:left;">
+mpg
+</th>
+<th style="text-align:left;">
+cyl
+</th>
+<th style="text-align:left;">
+disp
+</th>
+<th style="text-align:left;">
+hp
+</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:left;">
+Mazda RX4
+</td>
+<td style="text-align:left;">
+<span style="display: block; padding: 0 4px; border-radius: 4px; background-color: #ffcc6f">21.0</span>
+</td>
+<td style="text-align:left;">
+<span style="-webkit-transform: rotate(60deg); -moz-transform: rotate(60deg); -ms-transform: rotate(60deg); -o-transform: rotate(60deg); transform: rotate(60deg); display: inline-block; "><span style="color: white;border-radius: 4px; padding-right: 4px; padding-left: 4px; background-color: red;text-align: center;">6</span></span>
+</td>
+<td style="text-align:left;">
+<span style=" font-style: italic;color: green;">160</span>
+</td>
+<td style="text-align:left;width: 3cm; display: inline-block; ">
+<span style="display: inline-block; direction: rtl; border-radius: 4px; padding-right: 2px; background-color: lightgreen; width: 62.86%">110</span>
+</td>
+</tr>
+<tr>
+<td style="text-align:left;">
+Mazda RX4 Wag
+</td>
+<td style="text-align:left;">
+<span style="display: block; padding: 0 4px; border-radius: 4px; background-color: #ffcc6f">21.0</span>
+</td>
+<td style="text-align:left;">
+<span style="-webkit-transform: rotate(120deg); -moz-transform: rotate(120deg); -ms-transform: rotate(120deg); -o-transform: rotate(120deg); transform: rotate(120deg); display: inline-block; "><span style="color: white;border-radius: 4px; padding-right: 4px; padding-left: 4px; background-color: red;text-align: center;">6</span></span>
+</td>
+<td style="text-align:left;">
+<span style=" font-style: italic;color: green;">160</span>
+</td>
+<td style="text-align:left;width: 3cm; display: inline-block; ">
+<span style="display: inline-block; direction: rtl; border-radius: 4px; padding-right: 2px; background-color: lightgreen; width: 62.86%">110</span>
+</td>
+</tr>
+<tr>
+<td style="text-align:left;">
+Datsun 710
+</td>
+<td style="text-align:left;">
+<span style="display: block; padding: 0 4px; border-radius: 4px; background-color: #ffa500">22.8</span>
+</td>
+<td style="text-align:left;">
+<span style="-webkit-transform: rotate(180deg); -moz-transform: rotate(180deg); -ms-transform: rotate(180deg); -o-transform: rotate(180deg); transform: rotate(180deg); display: inline-block; "><span style="color: white;border-radius: 4px; padding-right: 4px; padding-left: 4px; background-color: red;text-align: center;">4</span></span>
+</td>
+<td style="text-align:left;">
+<span style=" font-style: italic;color: green;">108</span>
+</td>
+<td style="text-align:left;width: 3cm; display: inline-block; ">
+<span style="display: inline-block; direction: rtl; border-radius: 4px; padding-right: 2px; background-color: lightgreen; width: 53.14%">93</span>
+</td>
+</tr>
+<tr>
+<td style="text-align:left;">
+Hornet 4 Drive
+</td>
+<td style="text-align:left;">
+<span style="display: block; padding: 0 4px; border-radius: 4px; background-color: #ffc357">21.4</span>
+</td>
+<td style="text-align:left;">
+<span style="-webkit-transform: rotate(240deg); -moz-transform: rotate(240deg); -ms-transform: rotate(240deg); -o-transform: rotate(240deg); transform: rotate(240deg); display: inline-block; "><span style="color: white;border-radius: 4px; padding-right: 4px; padding-left: 4px; background-color: red;text-align: center;">6</span></span>
+</td>
+<td style="text-align:left;">
+<span style=" font-weight: bold;color: red;">258</span>
+</td>
+<td style="text-align:left;width: 3cm; display: inline-block; ">
+<span style="display: inline-block; direction: rtl; border-radius: 4px; padding-right: 2px; background-color: lightgreen; width: 62.86%">110</span>
+</td>
+</tr>
+<tr>
+<td style="text-align:left;">
+Hornet Sportabout
+</td>
+<td style="text-align:left;">
+<span style="display: block; padding: 0 4px; border-radius: 4px; background-color: #ffffff">18.7</span>
+</td>
+<td style="text-align:left;">
+<span style="-webkit-transform: rotate(300deg); -moz-transform: rotate(300deg); -ms-transform: rotate(300deg); -o-transform: rotate(300deg); transform: rotate(300deg); display: inline-block; "><span style="color: white;border-radius: 4px; padding-right: 4px; padding-left: 4px; background-color: red;text-align: center;">8</span></span>
+</td>
+<td style="text-align:left;">
+<span style=" font-weight: bold;color: red;">360</span>
+</td>
+<td style="text-align:left;width: 3cm; display: inline-block; ">
+<span style="display: inline-block; direction: rtl; border-radius: 4px; padding-right: 2px; background-color: lightgreen; width: 100.00%">175</span>
+</td>
+</tr>
+</tbody>
+</table>
+</div>
 </div>
 <div id="grouped-columns-rows" class="section level1">
 <h1>Grouped Columns / Rows</h1>
@@ -3398,7 +3541,7 @@
 1
 </td>
 <td style="text-align:center;">
-0
+1
 </td>
 </tr>
 <tr>
@@ -3406,7 +3549,7 @@
 2
 </td>
 <td style="text-align:center;">
-0
+1
 </td>
 </tr>
 <tr>
@@ -3414,7 +3557,7 @@
 3
 </td>
 <td style="text-align:center;">
-0
+1
 </td>
 </tr>
 <tr>
@@ -3438,7 +3581,7 @@
 6
 </td>
 <td style="text-align:center;">
-1
+0
 </td>
 </tr>
 <tr>
@@ -3446,7 +3589,7 @@
 7
 </td>
 <td style="text-align:center;">
-1
+0
 </td>
 </tr>
 <tr>
@@ -3473,7 +3616,7 @@
 10
 </td>
 <td style="text-align:center;">
-1
+0
 </td>
 </tr>
 <tr>
@@ -3514,7 +3657,7 @@
 14
 </td>
 <td style="text-align:center;">
-1
+0
 </td>
 </tr>
 <tr>
diff --git a/docs/awesome_table_in_pdf.Rmd b/docs/awesome_table_in_pdf.Rmd
index 52da10b..c55af6b 100644
--- a/docs/awesome_table_in_pdf.Rmd
+++ b/docs/awesome_table_in_pdf.Rmd
@@ -258,8 +258,8 @@
 ```{r}
 sometext <- strsplit(paste0(
   "You can even try to make some crazy things like this paragraph. ", 
-  "It seems to be a useless feature at this moment but who cares. ", 
-  "It is so fun to play with color that I can't stop. ;D"
+  "It seems to be a useless feature at this moment but it's so cool ",
+  "that nobody can resist. ;)"
 ), " ")[[1]]
 text_formatted <- paste(
   text_spec(sometext, "latex", color = spec_color(1:length(sometext), end = 0.9),
diff --git a/inst/NEWS.md b/inst/NEWS.md
index 23ae047..8b3d3ca 100644
--- a/inst/NEWS.md
+++ b/inst/NEWS.md
@@ -1,3 +1,29 @@
+kableExtra 0.6.0
+--------------------------------------------------------------------------------
+* Added cell_spec for HTML & LaTeX
+
+* Added helper functions including spec_color, spec_font_size, spec_angle, 
+spec_tooltip & spec_popover to facilitate the cell_spec function.
+
+* Added align/rotate/font_size to row_spec
+
+* Allowed row_spec to modify header row with row_spec(0, ...)
+
+* Improved `repeat_header` in LaTeX for longtables. Now you can write texts like
+"continued on next page"
+
+* Fixed a critical bug with latex group_rows (#68)
+
+* Escape question mark ? in regex_escape (thanks @nichtleiter)
+
+* Switched from readr::write_file to base::writeLines (for support in earlier 
+version of readr)
+
+* Switched from sub to str_replace in some places due to a bug in sub on 
+Windows.
+
+
+
 kableExtra 0.5.2
 --------------------------------------------------------------------------------
 * Request from CRAN: Changed dependency on `magick` from Imports to Suggest. 
diff --git a/man/cell_spec.Rd b/man/cell_spec.Rd
index 2e758b0..40966ca 100644
--- a/man/cell_spec.Rd
+++ b/man/cell_spec.Rd
@@ -43,7 +43,8 @@
 from \code{l}, \code{c} & \code{r}.}
 
 \item{font_size}{A numeric input for font size. For HTML, you can also use
-options}
+options including \code{xx-small}, \code{x-small}, \code{small}, \code{medium}, \code{large},
+\code{x-large}, \code{xx-large}, \code{smaller}, \code{larger}, \code{initial} and \code{inherit}.}
 
 \item{angle}{0-360, degree that the text will rotate. Can be a vector.}
 
diff --git a/man/row_spec.Rd b/man/row_spec.Rd
index ef7712c..6b037ea 100644
--- a/man/row_spec.Rd
+++ b/man/row_spec.Rd
@@ -33,8 +33,9 @@
 be \code{l}, \code{c}, \code{r} plus \code{left}, \code{center}, \code{right}, \code{justify}, \code{initial} and \code{inherit}
 while for LaTeX, you can only choose from \code{l}, \code{c} & \code{r}.}
 
-\item{font_size}{Only if you want to specify font size locally in HTML.
-This feature is not available in LaTeX}
+\item{font_size}{A numeric input for font size. For HTML, you can also use
+options including \code{xx-small}, \code{x-small}, \code{small}, \code{medium}, \code{large},
+\code{x-large}, \code{xx-large}, \code{smaller}, \code{larger}, \code{initial} and \code{inherit}.}
 
 \item{angle}{0-360, degree that the text will rotate.}
 }
diff --git a/tests/visual_tests/column_row_spec_pdf.Rmd b/tests/visual_tests/column_row_spec_pdf.Rmd
index 10d3d36..e8fef90 100644
--- a/tests/visual_tests/column_row_spec_pdf.Rmd
+++ b/tests/visual_tests/column_row_spec_pdf.Rmd
@@ -43,7 +43,7 @@
   column_spec(2, "3cm", bold = T, border_right = T) %>%
   column_spec(3, monospace = T)%>%
   column_spec(4, "3cm", italic = T, color = "red", border_left = T, background = "blue")  %>%
-  row_spec(0, bold = T, italic = T, align = "l") %>%
+  row_spec(0, bold = T, italic = T, align = "l", font_size = 20) %>%
   row_spec(3, monospace = T, color = "yellow", background = "black")
 ```
 
diff --git a/vignettes/awesome_table_in_html.Rmd b/vignettes/awesome_table_in_html.Rmd
index 33c2297..fd5ee57 100644
--- a/vignettes/awesome_table_in_html.Rmd
+++ b/vignettes/awesome_table_in_html.Rmd
@@ -205,8 +205,8 @@
 ```{r}
 sometext <- strsplit(paste0(
   "You can even try to make some crazy things like this paragraph. ", 
-  "It seems to be a useless feature at this moment but who cares. ", 
-  "It is so fun to play with color that I can't stop. ;D"
+  "It seems to be a useless feature at this moment but it's so cool ",
+  "that nobody can resist. ;)"
 ), " ")[[1]]
 text_formatted <- paste(
   text_spec(sometext, "html", color = spec_color(1:length(sometext), end = 0.9),
@@ -271,6 +271,28 @@
 `text_spec("Hover on me", link = "javascript:void(0)", popover = "Hello")`:
 `r text_spec("Hover on me", link = "javascript:void(0)", popover = "Hello")`
 
+## Integration with `formattable` 
+You can combine the good parts from `kableExtra` & `formattable` together into one piece. Read more at http://haozhu233.github.io/kableExtra/use_kableExtra_with_formattable.html
+```{r, message = FALSE, warning=FALSE}
+library(formattable)
+mtcars[1:5, 1:4] %>%
+  mutate(
+    car = row.names(.),
+    mpg = color_tile("white", "orange")(mpg),
+    cyl = cell_spec(cyl, "html", angle = (1:5)*60, 
+                    background = "red", color = "white", align = "center"),
+    disp = ifelse(disp > 200,
+                  cell_spec(disp, "html", color = "red", bold = T),
+                  cell_spec(disp, "html", color = "green", italic = T)),
+    hp = color_bar("lightgreen")(hp)
+  ) %>%
+  select(car, everything()) %>%
+  kable("html", escape = F) %>%
+  kable_styling("hover", full_width = F) %>%
+  column_spec(5, width = "3cm") %>%
+  add_header_above(c(" ", "Hello" = 2, "World" = 2))
+```
+
 
 # Grouped Columns / Rows
 ## Add header rows to group columns
diff --git a/vignettes/awesome_table_in_pdf.Rmd b/vignettes/awesome_table_in_pdf.Rmd
index 52da10b..c55af6b 100644
--- a/vignettes/awesome_table_in_pdf.Rmd
+++ b/vignettes/awesome_table_in_pdf.Rmd
@@ -258,8 +258,8 @@
 ```{r}
 sometext <- strsplit(paste0(
   "You can even try to make some crazy things like this paragraph. ", 
-  "It seems to be a useless feature at this moment but who cares. ", 
-  "It is so fun to play with color that I can't stop. ;D"
+  "It seems to be a useless feature at this moment but it's so cool ",
+  "that nobody can resist. ;)"
 ), " ")[[1]]
 text_formatted <- paste(
   text_spec(sometext, "latex", color = spec_color(1:length(sometext), end = 0.9),