diff --git a/runtime/syntax/css.vim b/runtime/syntax/css.vim
index 73bbd8d..f915b4d 100644
--- a/runtime/syntax/css.vim
+++ b/runtime/syntax/css.vim
@@ -1,11 +1,12 @@
 " Vim syntax file
 " Language:     Cascading Style Sheets
 " Previous Contributor List:
+"               Jules Wang      <w.jq0722@gmail.com>
 "               Claudio Fleiner <claudio@fleiner.com> (Maintainer)
 "               Yeti            (Add full CSS2, HTML4 support)
 "               Nikolai Weibull (Add CSS2 support)
-" URL:          https://github.com/JulesWang/css.vim
-" Maintainer:   Jules Wang      <w.jq0722@gmail.com>
+" URL:          https://github.com/jsit/css.vim
+" Maintainer:   Jay Sitter <jay@jaysitter.com>
 " Last Change:  2019 Jul. 29
 
 " quit when a syntax file was already loaded
@@ -68,7 +69,7 @@
 " digits
 syn match cssValueInteger contained "[-+]\=\d\+" contains=cssUnitDecorators
 syn match cssValueNumber contained "[-+]\=\d\+\(\.\d*\)\=" contains=cssUnitDecorators
-syn match cssValueLength contained "[-+]\=\d\+\(\.\d*\)\=\(mm\|cm\|in\|pt\|pc\|em\|ex\|px\|rem\|dpi\|dppx\|dpcm\|fr\|vw\|vh\|vmin\|vmax\)\>" contains=cssUnitDecorators
+syn match cssValueLength contained "[-+]\=\d\+\(\.\d*\)\=\(mm\|cm\|in\|pt\|pc\|em\|ex\|px\|rem\|dpi\|dppx\|dpcm\|fr\|vw\|vh\|vmin\|vmax\|ch\)\>" contains=cssUnitDecorators
 syn match cssValueLength contained "[-+]\=\d\+\(\.\d*\)\=%" contains=cssUnitDecorators
 syn match cssValueAngle contained "[-+]\=\d\+\(\.\d*\)\=\(deg\|grad\|rad\)\>" contains=cssUnitDecorators
 syn match cssValueTime contained "+\=\d\+\(\.\d*\)\=\(ms\|s\)\>" contains=cssUnitDecorators
@@ -128,12 +129,14 @@
 syn region cssFunction contained matchgroup=cssFunctionName start="\<\(rgba\|hsl\|hsla\|color-stop\|from\|to\)\s*(" end=")" oneline  contains=cssColor,cssValueInteger,cssValueNumber,cssValueLength,cssFunctionComma,cssFunction
 syn region cssFunction contained matchgroup=cssFunctionName start="\<\(linear-\|radial-\)\=\gradient\s*(" end=")" oneline  contains=cssColor,cssValueInteger,cssValueNumber,cssValueLength,cssFunction,cssGradientAttr,cssFunctionComma
 syn region cssFunction contained matchgroup=cssFunctionName start="\<\(matrix\(3d\)\=\|scale\(3d\|X\|Y\|Z\)\=\|translate\(3d\|X\|Y\|Z\)\=\|skew\(X\|Y\)\=\|rotate\(3d\|X\|Y\|Z\)\=\|perspective\)\s*(" end=")" oneline contains=cssValueInteger,cssValueNumber,cssValueLength,cssValueAngle,cssFunctionComma
+syn region cssFunction contained matchgroup=cssFunctionName start="\<\(blur\|brightness\|contrast\|drop-shadow\|grayscale\|hue-rotate\|invert\|opacity\|saturate\|sepia\)\s*(" end=")" oneline contains=cssValueInteger,cssValueNumber,cssValueLength,cssValueAngle,cssFunctionComma
 syn keyword cssGradientAttr contained top bottom left right cover center middle ellipse at
 syn match cssFunctionComma contained ","
 
 " Common Prop and Attr
 syn keyword cssCommonAttr contained auto none inherit all default normal
 syn keyword cssCommonAttr contained top bottom center stretch hidden visible
+syn match cssCommonAttr contained "\<\(max-\|min-\|fit-\)content\>"
 "------------------------------------------------
 " CSS Animations
 " http://www.w3.org/TR/css3-animations/
diff --git a/runtime/syntax/fstab.vim b/runtime/syntax/fstab.vim
index e416a9a..6b17b5a 100644
--- a/runtime/syntax/fstab.vim
+++ b/runtime/syntax/fstab.vim
@@ -2,8 +2,8 @@
 " Language: fstab file
 " Maintainer: Radu Dineiu <radu.dineiu@gmail.com>
 " URL: https://raw.github.com/rid9/vim-fstab/master/fstab.vim
-" Last Change: 2019 Jun 06
-" Version: 1.3
+" Last Change: 2020 Aug 06
+" Version: 1.4
 "
 " Credits:
 "   David Necas (Yeti) <yeti@physics.muni.cz>
@@ -68,7 +68,7 @@
 syn keyword fsOptionsYesNo yes no
 syn cluster fsOptionsCheckCluster contains=fsOptionsExt2Check,fsOptionsFatCheck
 syn keyword fsOptionsSize 512 1024 2048
-syn keyword fsOptionsGeneral async atime auto bind current defaults dev devgid devmode devmtime devuid dirsync exec force fstab kudzu loop mand move noatime noauto noclusterr noclusterw nodev nodevmtime nodiratime noexec nomand norelatime nosuid nosymfollow nouser owner rbind rdonly relatime remount ro rq rw suid suiddir supermount sw sync union update user users wxallowed xx nofail
+syn keyword fsOptionsGeneral async atime auto bind current defaults dev devgid devmode devmtime devuid dirsync exec force fstab kudzu loop mand move noatime noauto noclusterr noclusterw nodev nodevmtime nodiratime noexec nomand norelatime nosuid nosymfollow nouser owner rbind rdonly relatime remount ro rq rw suid suiddir supermount sw sync union update user users wxallowed xx nofail failok
 syn match fsOptionsGeneral /_netdev/
 
 " Options: adfs
diff --git a/runtime/syntax/help.vim b/runtime/syntax/help.vim
index b03dd59..a4c34cd 100644
--- a/runtime/syntax/help.vim
+++ b/runtime/syntax/help.vim
@@ -1,7 +1,7 @@
 " Vim syntax file
 " Language:	Vim help file
 " Maintainer:	Bram Moolenaar (Bram@vim.org)
-" Last Change:	2020 Mar 06
+" Last Change:	2020 Jul 28
 
 " Quit when a (custom) syntax file was already loaded
 if exists("b:current_syntax")
diff --git a/runtime/syntax/pamconf.vim b/runtime/syntax/pamconf.vim
index 10d667b..2913284 100644
--- a/runtime/syntax/pamconf.vim
+++ b/runtime/syntax/pamconf.vim
@@ -1,7 +1,8 @@
 " Vim syntax file
 " Language:             pam(8) configuration file
 " Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2011-08-03
+" Latest Revision:      2020/08/04
+" Changes By:		Haochen Tong
 
 
 if exists("b:current_syntax")
@@ -11,23 +12,32 @@
 let s:cpo_save = &cpo
 set cpo&vim
 
-syn match   pamconfService          '^[[:graph:]]\+'
-                                    \ nextgroup=pamconfType,
-                                    \ pamconfServiceLineCont skipwhite
+let s:has_service_field = exists("b:pamconf_has_service_field")
+      \ ? b:pamconf_has_service_field
+      \ : expand('%:t') == 'pam.conf' ? 1 : 0
+
+syn match   pamconfType             '-\?[[:alpha:]]\+'
+                                    \ contains=pamconfTypeKeyword
+                                    \ nextgroup=pamconfControl,
+                                    \ pamconfTypeLineCont skipwhite
+
+syn keyword pamconfTypeKeyword      contained account auth password session
+
+if s:has_service_field
+    syn match   pamconfService          '^[[:graph:]]\+'
+                                        \ nextgroup=pamconfType,
+                                        \ pamconfServiceLineCont skipwhite
+
+    syn match   pamconfServiceLineCont  contained '\\$'
+                                        \ nextgroup=pamconfType,
+                                        \ pamconfServiceLineCont skipwhite skipnl
+endif
 
 syn keyword pamconfTodo             contained TODO FIXME XXX NOTE
 
 syn region  pamconfComment          display oneline start='#' end='$'
                                     \ contains=pamconfTodo,@Spell
 
-syn match   pamconfServiceLineCont  contained '\\$'
-                                    \ nextgroup=pamconfType,
-                                    \ pamconfServiceLineCont skipwhite skipnl
-
-syn keyword pamconfType             account auth password session
-                                    \ nextgroup=pamconfControl,
-                                    \ pamconfTypeLineCont skipwhite
-
 syn match   pamconfTypeLineCont     contained '\\$'
                                     \ nextgroup=pamconfControl,
                                     \ pamconfTypeLineCont skipwhite skipnl
@@ -98,7 +108,8 @@
 hi def link pamconfComment          Comment
 hi def link pamconfService          Statement
 hi def link pamconfServiceLineCont  Special
-hi def link pamconfType             Type
+hi def link pamconfType             Special
+hi def link pamconfTypeKeyword      Type
 hi def link pamconfTypeLineCont     pamconfServiceLineCont
 hi def link pamconfControl          Macro
 hi def link pamconfControlBegin     Delimiter