diff --git a/Changelog.md b/Changelog.md
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,9 @@
+### 0.3.1.0
+
+- Do not throw the error if */dev/tty* cannot be open. Note that Neovim loads
+  the syntax engine without *tty* emulation just fine. This allows using Neovim
+  as *VIMHL_BACKEND* in environments where */dev/tty* is unavailable.
+
 ### 0.3.0.0
 
 - Support for packages *base* < *4.8* and *pandoc-types* < *1.20* was
diff --git a/pandoc-vimhl.cabal b/pandoc-vimhl.cabal
--- a/pandoc-vimhl.cabal
+++ b/pandoc-vimhl.cabal
@@ -1,5 +1,5 @@
 name:                    pandoc-vimhl
-version:                 0.3.0.0
+version:                 0.3.1.0
 synopsis:                Pandoc filter for native Vim code highlighting
 description:             Pandoc filter for native Vim code highlighting
         in HTML and PDF documents. Requires Vim (or Neovim) and plugin
diff --git a/vimhl.hs b/vimhl.hs
--- a/vimhl.hs
+++ b/vimhl.hs
@@ -65,17 +65,20 @@
                                 ,vimhlcmd ++ "' -c 'w!", dst ++ "' -c 'qa!'"
                                 ,src
                                 ]
-                    {- vim must think that it was launched from a terminal,
+                    {- Vim must think that it was launched from a terminal,
                      - otherwise it won't load its usual environment and the
-                     - syntax engine! Using WriteMode for stdin prevents vim
+                     - syntax engine! Using WriteMode for stdin prevents Vim
                      - from getting unresponsive on Ctrl-C interrupts while
-                     - still doing well its task (vim checks that input is a
+                     - still doing well its task (Vim checks that input is a
                      - terminal using isatty(), however it does not check the
-                     - mode of the handle). -}
-                    hin <- openFile "/dev/tty" WriteMode
+                     - mode of the handle). Note that Neovim loads the syntax
+                     - engine without tty emulation just fine. -}
+                    hin <- (Just <$> openFile "/dev/tty" WriteMode)
+                        `catchIOError` const (return Nothing)
                     hout <- openFile "/dev/null" WriteMode
-                    (_, _, _, handle) <- createProcess (shell vimcmd)
-                        {std_in = UseHandle hin, std_out = UseHandle hout}
+                    (_, _, _, handle) <- createProcess $
+                        let cmd = (shell vimcmd) {std_out = UseHandle hout}
+                        in maybe cmd (\h -> cmd {std_in = UseHandle h}) hin
                     r <- waitForProcess handle
                     unless (r == ExitSuccess) $ exitWith r
                     T.readFile dst
@@ -83,6 +86,8 @@
     where namevals' = map (map toLower . T.unpack *** T.unpack) namevals
           fm' | fm == Format "latex" = fm
               | otherwise = Format "html"
+          {- Note that Github markdown sanitizer strips CSS styles in HTML
+           - tags. See details at https://github.com/github/markup. -}
           wrap "gfm" block = T.concat
               ["<div class=\"highlight notranslate \
                \position-relative overflow-auto\" dir=\"auto\" \