Re: [csswg-drafts] [css-mixins] FunctionParameter dictionary should not have any required members (#13394)

An additional point here is that the WPT test, https://wpt.fyi/results/css/css-mixins/at-function-cssom.html, expects the dictionaries returned from `CSSFunctionRule` `getParameters()` to not have a `defaultValue` field at all if no default was specified, implying that the spec text that reads:

> "The [default value](https://drafts.csswg.org/css-mixins/#default-value) of the [function parameter](https://drafts.csswg.org/css-mixins/#function-parameter), or `null` if the argument does not have a default"

is not correct, and returning `null` is wrong.

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Received on Sunday, 25 January 2026 18:54:48 UTC