On Twitter, Google’s Eric Bidelman said that GoogleBot is unable to crawl CSS custom properties:
PSA: Google Search crawler ? is based on Chrome 41 [1], which does NOT support CSS Custom Properties [2]. If your layout/design relies on vars, make sure you're compiling CSS so your page renders properly. I wasn't ?
— Eric Bidelman (@ebidel) 28. February 2018
[1]: https://t.co/ZinziTp4oT
[2]: https://t.co/PtAAR4ZOHq* pic.twitter.com/w4AhujZYSQ
There are many other things that can cause problems with GoogleBot. You can check this with the website audit tool in SEOprofiler. If you haven’t done it yet, create your free SEOprofiler account here: