PHP CSS Parser
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Downloaded from: https://github.com/sabberworm/PHP-CSS-Parser/releases/tag/8.3.0

Import procedure:

- Copy all the files from the folder 'lib/Sabberworm/CSS/' in this directory.

- Apply the patch in Sabberworm/PHP-CSS-Parser#115

- Apply the patch in sabberworm/PHP-CSS-Parser/issues/173 (if this has not already been resolved upstream).