diff --git a/autoload/syntastic/util.vim b/autoload/syntastic/util.vim
index 2fafc782..c73eb6ce 100644
--- a/autoload/syntastic/util.vim
+++ b/autoload/syntastic/util.vim
@@ -6,6 +6,12 @@ let g:loaded_syntastic_util_autoload = 1
 let s:save_cpo = &cpo
 set cpo&vim
 
+if !exists("g:syntastic_debug")
+    let g:syntastic_debug = 0
+endif
+
+let s:deprecationNoticesIssued = []
+
 function! syntastic#util#DevNull()
     if has('win32')
         return 'NUL'
@@ -23,7 +29,7 @@ endfunction
 "returns
 "
 "{'exe': '/usr/bin/perl', 'args': ['-f', '-bar']}
-function! syntastic#util#ParseShebang()
+function! syntastic#util#parseShebang()
     for lnum in range(1,5)
         let line = getline(lnum)
 
@@ -92,16 +98,6 @@ function! syntastic#util#wideMsg(msg)
     let &showcmd=old_showcmd
 endfunction
 
-if !exists("g:syntastic_debug")
-    let g:syntastic_debug = 0
-endif
-
-function! syntastic#util#debug(msg)
-    if g:syntastic_debug
-        echomsg "(Syntastic debug) - " . a:msg
-    endif
-endfunction
-
 " Check whether a buffer is loaded, listed, and not hidden
 function! syntastic#util#bufIsActive(buffer)
     " convert to number, or hell breaks loose
@@ -121,6 +117,18 @@ function! syntastic#util#bufIsActive(buffer)
     return 0
 endfunction
 
+" Used to sort error lists
+function! syntastic#util#compareErrorItems(a, b)
+    if a:a['lnum'] != a:b['lnum']
+        return a:a['lnum'] - a:b['lnum']
+    elseif a:a['type'] !=? a:b['type']
+        " errors take precedence over warnings
+        return a:a['type'] ==? 'e' ? -1 : 1
+    else
+        return a:a['col'] - a:b['col']
+    endif
+endfunction
+
 " List of buffers referenced by the location list
 function! syntastic#util#unique(list)
     let seen = {}
@@ -130,7 +138,12 @@ function! syntastic#util#unique(list)
     return keys(seen)
 endfunction
 
-let s:deprecationNoticesIssued = []
+function! syntastic#util#debug(msg)
+    if g:syntastic_debug
+        echomsg "syntastic: debug: " . a:msg
+    endif
+endfunction
+
 function! syntastic#util#deprecationWarn(msg)
     if index(s:deprecationNoticesIssued, a:msg) >= 0
         return
diff --git a/syntax_checkers/cpp/cpplint.vim b/syntax_checkers/cpp/cpplint.vim
index 6172749e..48cf415b 100644
--- a/syntax_checkers/cpp/cpplint.vim
+++ b/syntax_checkers/cpp/cpplint.vim
@@ -47,9 +47,8 @@ function! SyntaxCheckers_cpp_cpplint_GetLocList()
     let loclist = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat, 'subtype': 'Style' })
 
     " change error types according to the prescribed threshold
-    for n in range(0, len(loclist) - 1)
+    for n in range(len(loclist))
         let loclist[n]['type'] = loclist[n]['type'] < g:syntastic_cpp_cpplint_thres ? 'W' : 'E'
-        let n -= 1
     endfor
 
     return loclist
diff --git a/syntax_checkers/css/prettycss.vim b/syntax_checkers/css/prettycss.vim
index 51a90a9c..764f9aee 100644
--- a/syntax_checkers/css/prettycss.vim
+++ b/syntax_checkers/css/prettycss.vim
@@ -44,15 +44,11 @@ function! SyntaxCheckers_css_prettycss_GetLocList()
         \ '%-G%.%#'
 
     let loclist = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat, 'defaults': {'bufnr': bufnr("")} })
-    for n in range(0, len(loclist) - 1)
+    for n in range(len(loclist))
         let loclist[n]["text"] .= ')'
     endfor
 
-    return sort(loclist, 's:CmpLoclist')
-endfunction
-
-function! s:CmpLoclist(a, b)
-    return a:a['lnum'] - a:b['lnum']
+    return sort(loclist, 'syntastic#util#compareErrorItems')
 endfunction
 
 call g:SyntasticRegistry.CreateAndRegisterChecker({
diff --git a/syntax_checkers/html/w3.vim b/syntax_checkers/html/w3.vim
index 18e774c5..073f5862 100644
--- a/syntax_checkers/html/w3.vim
+++ b/syntax_checkers/html/w3.vim
@@ -21,21 +21,11 @@ endfunction
 function! SyntaxCheckers_html_w3_GetLocList()
     let makeprg2="curl -s -F output=text -F \"uploaded_file=@".expand('%:p').";type=text/html\" http://validator.w3.org/check \\| sed -n -e '/\<em\>Line\.\*/ \{ N; s/\\n//; N; s/\\n//; /msg/p; \}' -e ''/msg_warn/p'' -e ''/msg_info/p'' \\| sed -e 's/[ ]\\+/ /g' -e 's/\<[\^\>]\*\>//g' -e 's/\^[ ]//g'"
     let errorformat2='Line %l\, Column %c: %m'
-    let loclist = SyntasticMake({ 'makeprg': makeprg2, 'errorformat': errorformat2 })
+    let loclist = SyntasticMake({ 'makeprg': makeprg2, 'errorformat': errorformat2, 'defaults': {'bufnr': bufnr("")} })
 
-    let n = len(loclist) - 1
-    let bufnum = bufnr("")
-    while n >= 0
-        let i = loclist[n]
-        let i['bufnr'] = bufnum
-
-        if i['lnum'] == 0
-            let i['type'] = 'w'
-        else
-            let i['type'] = 'e'
-        endif
-        let n -= 1
-    endwhile
+    for n in range(len(loclist))
+        let loclist[n]['type'] = loclist[n]['lnum'] ? 'E' : 'W'
+    endfor
 
     return loclist
 endfunction
diff --git a/syntax_checkers/perl/perl.vim b/syntax_checkers/perl/perl.vim
index 86a6689c..e9eabdc9 100644
--- a/syntax_checkers/perl/perl.vim
+++ b/syntax_checkers/perl/perl.vim
@@ -52,7 +52,7 @@ function! SyntaxCheckers_perl_perl_GetLocList()
 endfunction
 
 function! s:ExtraMakeprgArgs()
-    let shebang = syntastic#util#ParseShebang()
+    let shebang = syntastic#util#parseShebang()
     if index(shebang['args'], '-T') != -1
         return ' -Tc'
     endif
diff --git a/syntax_checkers/perl/perlcritic.vim b/syntax_checkers/perl/perlcritic.vim
index d98ae8bd..45a6cec2 100644
--- a/syntax_checkers/perl/perlcritic.vim
+++ b/syntax_checkers/perl/perlcritic.vim
@@ -46,11 +46,9 @@ function! SyntaxCheckers_perl_perlcritic_GetLocList()
     let loclist = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat, 'subtype': 'Style' })
 
     " change error types according to the prescribed threshold
-    let n = len(loclist) - 1
-    while n >= 0
+    for n in range(len(loclist))
         let loclist[n]['type'] = loclist[n]['type'] < g:syntastic_perl_perlcritic_thres ? 'W' : 'E'
-        let n -= 1
-    endwhile
+    endfor
 
     return loclist
 endfunction
diff --git a/syntax_checkers/python/pylint.vim b/syntax_checkers/python/pylint.vim
index 67608c77..37fc7bec 100644
--- a/syntax_checkers/python/pylint.vim
+++ b/syntax_checkers/python/pylint.vim
@@ -26,17 +26,11 @@ function! SyntaxCheckers_python_pylint_GetLocList()
 
     let loclist=SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat })
 
-    let n = len(loclist) - 1
-    while n >= 0
+    for n in range(len(loclist))
         let loclist[n]['type'] = match(['R', 'C', 'W'], loclist[n]['text'][2]) >= 0 ? 'W' : 'E'
-        let n -= 1
-    endwhile
+    endfor
 
-    return sort(loclist, 's:CmpLoclist')
-endfunction
-
-function! s:CmpLoclist(a, b)
-    return a:a['lnum'] - a:b['lnum']
+    return sort(loclist, 'syntastic#util#compareErrorItems')
 endfunction
 
 call g:SyntasticRegistry.CreateAndRegisterChecker({
diff --git a/syntax_checkers/tex/chktex.vim b/syntax_checkers/tex/chktex.vim
index 989eb583..67b6e432 100644
--- a/syntax_checkers/tex/chktex.vim
+++ b/syntax_checkers/tex/chktex.vim
@@ -44,11 +44,8 @@ function! SyntaxCheckers_tex_chktex_GetLocList()
     let errorformat = '%EError\ %\\d%\\+\ in\ %f\ line\ %l:\ %m,%WWarning\ %\\d%\\+\ in\ %f\ line\ %l:\ %m,' .
                 \ (g:syntastic_tex_chktex_showmsgs ? '%WMessage\ %\\d%\\+\ in\ %f\ line %l:\ %m,' : '') .
                 \ '%+Z%p^,%-G%.%#'
-    return sort(SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat, 'subtype': 'Style' }), 's:CmpLoclist')
-endfunction
-
-function! s:CmpLoclist(a, b)
-    return a:a['lnum'] - a:b['lnum']
+    let loclist = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat, 'subtype': 'Style' })
+    return sort(loclist, 'syntastic#util#compareErrorItems')
 endfunction
 
 call g:SyntasticRegistry.CreateAndRegisterChecker({
diff --git a/syntax_checkers/xhtml/tidy.vim b/syntax_checkers/xhtml/tidy.vim
index a72c2136..dc1b480c 100644
--- a/syntax_checkers/xhtml/tidy.vim
+++ b/syntax_checkers/xhtml/tidy.vim
@@ -9,12 +9,21 @@
 "             See http://sam.zoy.org/wtfpl/COPYING for more details.
 "
 "============================================================================
+"
+" Checker option:
+"
+" - g:syntastic_xhtml_tidy_ignore_errors (list; default: [])
+"   list of errors to ignore
 
 if exists("g:loaded_syntastic_xhtml_tidy_checker")
     finish
 endif
 let g:loaded_syntastic_xhtml_tidy_checker=1
 
+if !exists('g:syntastic_xhtml_tidy_ignore_errors')
+    let g:syntastic_xhtml_tidy_ignore_errors = []
+endif
+
 function! SyntaxCheckers_xhtml_tidy_IsAvailable()
     return executable("tidy")
 endfunction
@@ -38,6 +47,15 @@ function! s:TidyEncOptByFenc()
     return get(tidy_opts, &fileencoding, '-utf8')
 endfunction
 
+function! s:IgnoreErrror(text)
+    for i in g:syntastic_xhtml_tidy_ignore_errors
+        if stridx(a:text, i) != -1
+            return 1
+        endif
+    endfor
+    return 0
+endfunction
+
 function! SyntaxCheckers_xhtml_tidy_GetLocList()
     let encopt = s:TidyEncOptByFenc()
     let makeprg = syntastic#makeprg#build({
@@ -48,7 +66,15 @@ function! SyntaxCheckers_xhtml_tidy_GetLocList()
         \ '%Wline %l column %c - Warning: %m,' .
         \ '%Eline %l column %c - Error: %m,' .
         \ '%-G%.%#'
-    return SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat, 'defaults': {'bufnr': bufnr("")} })
+    let loclist = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat, 'defaults': {'bufnr': bufnr("")} })
+
+    for n in range(len(loclist))
+        if loclist[n]['valid'] && s:IgnoreErrror(loclist[n]['text']) == 1
+            let loclist[n]['valid'] = 0
+        endif
+    endfor
+
+    return loclist
 endfunction
 
 call g:SyntasticRegistry.CreateAndRegisterChecker({