Hi,
:not() allows only a simple selector as argument but CSS::SAC
represents this incorrectly, e.g. it considers
:not(:first-child)
to be equivalent to
:not(*:first-child)
while it is not. The argument is either a ELEMENT_NODE_SELECTOR or a
Condition != AND_CONDITION (based on supported conditions, i.e.,
OR_CONDITION would probably also be invalid but we don't have
OR_CONDITIONs in CSS3).
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