| The HTML Cleaner
                          The HTML cleaner is a powerful filter which can polish grotty, messy HTML into
                          fully-standards-compliant glory. By default, all output of format
                          text/html (the default format) will be passed through it.
                          
                         
                          It is controlled using the clean parameter of the <out> tag.
                          The features to be used should be listed in this parameter's value, separated
                          by whitespace.
                          
                         
                          Here are the features available:
                          
                         
                          
                            
                              pack - Compress the HTML, removing all white space that is not
                               part of an attribute's value, or inside <xmp> or <pre> tags.
                              
                            
                            
                              indent - "Pretty-print" the HTML, indenting tags appropriately,
                               except for text and markup inside <xmp> or <pre> tags.
                              
                            
                            
                              nocomments - Trim all comments.
                              
                            
                            
                              addimgsizes - Add image sizes to <img> tags if they do not
                               already specify them.
                              
                            
                            
                              cleanattrs - Quote all attributes in opening tags, and lowercase
                               all tag names.
                              
                            
                            
                              addxmlslashes - Add XML-style slashes to the end of empty-element
                               tags, such as <hr>, <img> etc.
                              
                            
                            
                              fixcolors - Fix colors that do not start with a # character, so that
                               they do.
                              
                             
                          The feature string all can be used to include all cleaning modes.
                          
                         
                          The default mode is pack addimgsizes cleanattrs addxmlslashes
                          fixcolors indent. 
                          
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