fix(css): Add missing syntax <single-animation-composition>
for animation-composition
#789
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Description
add the missing syntax
<single-animation-composition>
update status of
animation-composition
Motivation
Additional details
https://drafts.csswg.org/css-animations-2/#propdef-animation-composition
https://drafts.csswg.org/css-animations-2/#typedef-single-animation-composition
Related issues and pull requests
reported in #597
/cc @lahmatiy