@Kyle yes I found out the “hard way”
@ED Thanks a lot used that , I am already using svg exported from Illustrator (2014) and they appear fine. However, for complex vector groups the code is quite huge and there are server issues possible. Will test on my loclahost but for most graphics, logos,some design elements, etc it is working. Large vector scenes are not that easy but this has nothing to do with the theme.
I just don’t know if the added lines on the function.php file will remain intact in case of updates. To be secure I am keeping note of everything I do to make my life easier in the future.