This is on top of https://github.com/servo/servo/pull/15928.
Now that cascade() gets a Device ref, we can use the default computed values
from there to avoid propagating that state all over the place.
Source-Repo: https://github.com/servo/servo
Source-Revision: 8c8edb8731dc01d254839d0922590fba72f278c6
Change code for serialization for {box,text}-shadow so blur-radius can be parsed as non-negavite
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Source-Repo: https://github.com/servo/servo
Source-Revision: 7db36abf67a1e300fb2b58f2b4543ebd1c591eeb
… their second part of value
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Fix parsing of ClipRect for clip property.
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