PHP CSS Parser
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Import procedure:
1. Download the latest release from https://github.com/sabberworm/PHP-CSS-Parser/releases
2. Copy all the files from the folder 'lib/Sabberworm/CSS/' in this directory.
3. Apply the following patches from the following pull requests if they have not yet been merged upstream:
   a. https://github.com/sabberworm/PHP-CSS-Parser/pull/115
   b. https://github.com/sabberworm/PHP-CSS-Parser/pull/173