Note: I'm not an upstream contributor, just a downstream user interested in this PR.
There are some style issues that I would suggest fixing so that it's mergeable:
You wrongly changed indentation in some places. Review the Git diff to find them (indentation changed from tabs to spaces, or sometimes extra tab indent where it was already correct).
Adapted @olivierchatry's code to provide basic style sheets support. It should cover Adobe Illustrator exports.
55