Some uses of `:has` throw "not a valid selector"

[aayla-secura]

I found two particular use cases of the :has selector, which work fine in modern browsers but nwsapi throws an error:

• div:has(>div) results in '>div' is not a valid selector (so having > at the start of the subselector string is treated as invalid)
• :has(div) results in '' is not a valid selector (so having :has at the start of the selector string seems to result in it being parsed as empty)

I believe the selectors above are valid and should be supported, am I wrong?

I should say I'm using version 2.2.12