Css style engine rework #1099

Job	Run time
clippy (stable)	40s
build (stable)	22s
fmt	18s
clippy (beta)	56s
build (beta)	31s
clippy (nightly)	46s
build (nightly)	31s
test (stable)	26s
clippy (1.73.0)	39s
clippy (stable minus 1 release)	40s
build (1.73.0)	23s
test (beta)	47s
clippy (stable minus 2 releases)	42s
build (stable minus 1 release)	1m 4s
test (nightly)	34s
build (stable minus 2 releases)	27s
test (1.73.0)	32s
test (stable minus 1 release)	55s
test (stable minus 2 releases)	37s
	11m 50s

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