How can I validate CSS on internal web pages?

Question

I want to check internal web pages, so I cannot use the W3C validation service directly. I managed to run the XHTML validator locally, however, I have some problems with the

Answer 1

That jar is runnable, but it needs some extra libraries.

Examine the MANIFEST.MF file:

$ unzip -p css-validator.jar META-INF/MANIFEST.MF
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.0
Created-By: 1.6.0_26-b03 (Sun Microsystems Inc.)
Main-Class: org.w3c.css.css.CssValidator
Class-Path: . lib/commons-collections-3.2.1.jar lib/commons-lang-2.6.j
 ar lib/jigsaw.jar lib/tagsoup-1.2.jar lib/velocity-1.7.jar lib/xerces
 Impl.jar lib/xml-apis.jar lib/htmlparser-1.3.1.jar

You need all the jars mentioned in Class-Path. You can download them from the maven repository using this script:

#!/bin/bash

set -e

mkdir -p lib
curl -LO http://www.w3.org/QA/Tools/css-validator/css-validator.jar
echo "\
http://repo1.maven.org/maven2/commons-collections/commons-collections/3.2.1/commons-collections-3.2.1.jar
http://repo1.maven.org/maven2/commons-lang/commons-lang/2.6/commons-lang-2.6.jar
http://repo1.maven.org/maven2/org/w3c/jigsaw/jigsaw/2.2.6/jigsaw-2.2.6.jar jigsaw.jar
http://repo1.maven.org/maven2/org/ccil/cowan/tagsoup/tagsoup/1.2/tagsoup-1.2.jar
http://repo1.maven.org/maven2/org/apache/velocity/velocity/1.7/velocity-1.7.jar
http://repo1.maven.org/maven2/xerces/xercesImpl/2.11.0/xercesImpl-2.11.0.jar xercesImpl.jar
http://repo1.maven.org/maven2/nu/validator/htmlparser/htmlparser/1.2.1/htmlparser-1.2.1.jar\
" | while read url shortname; do
        if [ -z "$shortname" ]; then
            shortname="${url##*/}"
        fi
        curl -L -o "lib/${shortname}" "${url}"
    done

After doing that, it works:

$ java -jar css-validator.jar --output=soap12 file:badcss.html
{vextwarning=false, output=soap12, lang=en, warning=2, medium=all, profile=css3}


    
        
            file:badcss.html
            http://jigsaw.w3.org/css-validator/
            css3
            2013-03-12T06:40:09Z
            false
            
                
                    1

                
                    file:badcss.html

                        
                            8
                            parse-error
                             h1         
                            
                                exp
                            
                            
                                100%
                            

                            

                                Property fnt-size doesn't exist : 
                            
                        

                    

                
                
                    1

                    
                        file:badcss.html

                        
                            5
                            0
                            You should add a 'type' attribute with a value of 'text/css' to the 'style' element