[w3ctag/design-reviews] TAG review of whether element.pseudo(":unkown") should return null or throw (#348)

こんにちはTAG！

I'm requesting a TAG review of:

  - Name: element.pseudo() return values / errors
  - Specification URL: https://www.w3.org/TR/css-pseudo-4/#window-interface  && https://drafts.csswg.org/css-pseudo-4/

  - Explainer, Requirements Doc, or Example code: https://github.com/w3c/csswg-drafts/issues/3603

  - Primary contacts: @fantasai
  - Current status: CSSWG is currently planning to spec always returning the object if the pseudo-element type is supported and always returning null if it's not, but wants to ask for the TAG's review to make sure the element.pseudo() pattern is consistent with the rest of the platform.

We'd prefer the TAG provide feedback by commenting in this issue (for comments relevant to that issue) https://github.com/w3c/csswg-drafts/issues/3603 or by opening new issues if more issues are found.


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