Our UA stylesheets (here, here and here) are mostly copied from web specs, and so contain features we do not support yet.
They're not especially more important than any other CSS features, but it would be nice if opening about:blank
didn't give us any CSS parsing errors.
Here is a list of them:
:popover-open
pseudo-class - specunicode-bidi
property - specmatch-parent
value for the text-align
property - specmin-content
value for the min-inline-size
property - specleft
and right
values for the justify-self
property - specfilter
property - specwriting-mode
property - spectext-space-collapse
property - should be renamed white-space-collapse
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