I came across that as well, as well as these two interesting blog posts: https://accodeing.com/blog/2015/duty-calls-css3-is-not-proven-to-be-turing-complete ht

I came across that as well, as well as these two interesting blog posts: https://accodeing.com/blog/2015/duty-calls-css3-is-not-proven-to-be-turing-complete https://accodeing.com/blog/2015/duty-calls-css3-is-not-prove... https://accodeing.com/blog/2015/css3-proven-to-be-turing-complete https://accodeing.com/blog/2015/css3-proven-to-be-turing-com... So yeah, it's most likely as powerful as our current computers.