Consider :has(), :not(), :is() as a standard pseudo-class if ExtendedCss usage is not forced by #?# rule marker

[slavaleleka]

:has() pseudo-class has native implementation
https://developer.mozilla.org/en-US/docs/Web/CSS/:has

and since ExtendedCss v2 release the rule with ## marker and :has() should not be considered as ExtendedCss

const rule1 = 'example.org##.sponsored:has(.banner)';
expect(rule1.isExtendedCss()).toBeFalsy();

but :has() pseudo-class should be considered as ExtendedCss if the rule marker is #?#

const rule2 = 'example.org#?#.sponsored:has(.banner)';
expect(rule2.isExtendedCss()).toBeTruthy();

https://github.com/AdguardTeam/ExtendedCss#extended-css-has

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related: AdguardTeam/SafariConverterLib#43

[ameshkov]

This one is a bit more complicated in the case of CoreLibs since this behavior depends on the browser version.

[slavaleleka]

pseudo-classes :not() and :is() should be handled in the same way as :has()
https://caniuse.com/mdn-css_selectors_not
https://caniuse.com/css-matches-pseudo