This new `CSSStyleOwner` variant is used when the pseudo-element
argument fails to parse properly or is for some unknown or unsupported
pseudo-element.
Testing: There are tests for this change. Various tests start to pass
and some start to
fail. New failures are due to partial or fully missing support for
pseudo-elements such
as:
- `::selection`
- `::first-letter` and `::first-line`
- `::marker`
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
