feat(css): Update syntax for content property
#976
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Description
update
contentproperty: addattr()update
<content-list>syntax: addattr(); removecontentsleader()and<target>which are not supported and non-standard at allnote that spec defines as
[ <string> | <image> | <attr()> | contents | <quote> | <leader()> | <target> | <string()> | <content()> | <counter> ]+, but many are not-supported so not added at presentMotivation
Additional details
https://developer.mozilla.org/en-US/docs/Web/CSS/content
https://drafts.csswg.org/css-content/#propdef-content
https://drafts.csswg.org/css-content/#typedef-content-content-list
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