Checker gjslint can check JavaScript in HTML files.

plugin/syntastic.vim

@@ -19,7 +19,7 @@ if has('reltime')
     lockvar! g:_SYNTASTIC_START
 endif
 
-let g:_SYNTASTIC_VERSION = '3.7.0-119'
+let g:_SYNTASTIC_VERSION = '3.7.0-120'
 lockvar g:_SYNTASTIC_VERSION
 
 " Sanity checks {{{1

syntax_checkers/html/gjslint.vim

@@ -0,0 +1,23 @@
+"============================================================================
+"File:        gjslint.vim
+"Description: Syntax checking plugin for syntastic
+"Maintainer:  LCD 47 <lcd047 at gmail dot com>
+"License:     This program is free software. It comes without any warranty,
+"             to the extent permitted by applicable law. You can redistribute
+"             it and/or modify it under the terms of the Do What The Fuck You
+"             Want To Public License, Version 2, as published by Sam Hocevar.
+"             See http://sam.zoy.org/wtfpl/COPYING for more details.
+"
+"============================================================================
+
+if exists('g:loaded_syntastic_html_gjslint_checker')
+    finish
+endif
+let g:loaded_syntastic_html_gjslint_checker = 1
+
+call g:SyntasticRegistry.CreateAndRegisterChecker({
+    \ 'filetype': 'html',
+    \ 'name': 'gjslint',
+    \ 'redirect': 'javascript/gjslint'})
+
+" vim: set sw=4 sts=4 et fdm=marker:

syntax_checkers/javascript/gjslint.vim

@@ -22,7 +22,7 @@ function! SyntaxCheckers_javascript_gjslint_GetLocList() dict
 
     let makeprg = self.makeprgBuild({
         \ 'args': '--nodebug_indentation',
-        \ 'args_after': '--nosummary --unix_mode --nobeep' })
+        \ 'args_after': '--check_html --nosummary --unix_mode --nobeep' })
 
     let errorformat =
         \ "%f:%l:(New Error -%\\?\%n) %m," .