add CSS3 syntax #3738

Job	Run time
Extract crate metadata	3s
Documentation	50s
cargo audit	6s
Ensure 'cargo fmt' has been run	18s
License checks	1m 50s
Run tests with updated syntaxes and themes	5m 29s
Run tests with system wide configuration	2m 26s
Minimum supported rust version	1m 27s
aarch64-unknown-linux-musl (ubuntu-20.04)	4m 1s
aarch64-unknown-linux-gnu (ubuntu-20.04)	4m 50s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	4m 17s
arm-unknown-linux-musleabihf (ubuntu-20.04)	4m 8s
i686-pc-windows-msvc (windows-2019)	6m 40s
i686-unknown-linux-gnu (ubuntu-20.04)	3m 50s
i686-unknown-linux-musl (ubuntu-20.04)	3m 45s
x86_64-apple-darwin (macos-12)	5m 47s
aarch64-apple-darwin (macos-14)	3m 11s
x86_64-pc-windows-gnu (windows-2019)	8m 1s
x86_64-pc-windows-msvc (windows-2019)	6m 27s
x86_64-unknown-linux-gnu (ubuntu-20.04)	3m 41s
x86_64-unknown-linux-musl (ubuntu-20.04)	3m 51s
all-jobs	1s
Publish to Winget	0s
	1h 14m 59s

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