[css-pseudo-4] Should Element.pseudo("unknown") be an error or return null? · Issue #3603 · w3c/csswg-drafts (original) (raw)

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Description

We resolved to have an Element.pseudo(type) interface that returns a CSSPseudoElement. What happens if someone passes a type that isn't known to the implementation? Do we treat it as non-existent or do we throw an error?

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