NAME

       HTML::Diff - compare two HTML strings and return a list of differences

SYNOPSIS

        use HTML::Diff;

        $result = html_word_diff($left_text, $right_text);

DESCRIPTION

       This module compares two strings of HTML and returns a list of a chunks which indicate the diff between
       the two input strings, where changes in formatting are considered changes.

       HTML::Diff does not strictly parse the HTML. Instead, it uses regular expressions to make a decent effort
       at understanding the given HTML.  As a result, there are many valid HTML documents for which it will not
       produce the correct answer. But there may be some invalid HTML documents for which it gives you the
       answer you're looking for. Your mileage may vary; test it on lots of inputs from your domain before
       relying on it.

       Returns a reference to a list of triples [<flag>, <left>, <right>].  Each triple represents a check of
       the input texts. The flag tells you whether it represents a deletion, insertion, a modification, or an
       unchanged chunk.

       Every character of each input text is accounted for by some triple in the output. Specifically,
       Concatenating all the <left> members from the return value should produce $left_text, and likewise the
       <right> members concatenate together to produce $right_text.

       The <flag> is either 'u', '+', '-', or 'c', indicating whether the two chunks are the same, the
       $right_text contained this chunk and the left chunk didn't, or vice versa, or the two chunks are simply
       different. This follows the usage of Algorithm::Diff.

       The difference is computed on a word-by-word basis, "breaking" on visible words in the HTML text. If a
       tag only is changed, it will not be returned as an independent chunk but will be shown as a change to one
       of the neighboring words. For balanced tags, such as <b> </b>, it is intended that a change to the tag
       will be treated as a change to all words in between.

SEE ALSO

       Algorithm::Diff provides the diff algorithm used in this module.

       XML::Diff can generate a diff between two XML files, and also patch an XML file, given a diff.

REPOSITORY

       <https://github.com/neilb/html-diff>

AUTHOR

       Whipped up by Ezra elias kilty Cooper, <ezra@ezrakilty.net>.

       Patch contributed by Adam <asjo@koldfront.dk>.

COPYRIGHT AND LICENSE

       Copyright 2003-2014 by Ezra elias kilty Cooper, <ezra@ezrakilty.net>

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.