On Wed, 8 Jan 2025 23:47:10 GMT, Michael Strauß <mstra...@openjdk.org> wrote:

>> The CSS Selectors specification defines the `:root` pseudo-class that 
>> matches root nodes:
>> https://www.w3.org/TR/selectors-4/#the-root-pseudo
>> 
>> JavaFX uses the non-standard `.root` style class for the same purpose. We 
>> should also support the `:root` pseudo-class for increased compatibility of 
>> JavaFX CSS with the web specification.
>> 
>> Additionally, we should also support the following child-indexed 
>> pseudo-classes:
>> `:first-child`
>> `:last-child`
>> `:only-child`
>> `:nth-child()` with arguments `even` and `odd`
>> 
>> The `An+B [of S]?` microsyntax for `:nth-child()` is not supported, as this 
>> would require major changes in JavaFX CSS.
>
> Michael Strauß has updated the pull request incrementally with one additional 
> commit since the last revision:
> 
>   updated cssref

By the way, I still think that front-inserting nodes one by one is a 
pathological situation, and can be easily fixed by just using `addAll` instead 
of `add` in a loop.

In terms of a future enhancement, I can't really see us put in a lot of work 
just for one pathological use case. Discarding this feature will probably put 
it in the "never" category. On the other hand, there's a whole category of 
pseudo-classes that are unrepresentable right now in JavaFX, as they basically 
depend on a formula, like `nth-child(2n+1)`. But that's just speculation at 
this point.

-------------

PR Comment: https://git.openjdk.org/jfx/pull/1652#issuecomment-2581067203

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