Add data points for nested pseudo-elements

[chrisdavidmills]

Summary

Chrome has added support for styling nested pseudo-elements, beginning in version 135 with ::after::marker and ::before::marker. See https://chromestatus.com/feature/5199947786616832.

This PR adds a data point for each of those two.

Test results and supporting details

Related issues

[caugner]

Shouldn't this rather go under css.selectors.marker?

browser-compat-data/css/selectors/marker.json

Line 6 in a1d970e

"description": "`::marker`",

[chrisdavidmills]

Shouldn't this rather go under css.selectors.marker?

browser-compat-data/css/selectors/marker.json

Line 6 in a1d970e

"description": "`::marker`",

Possibly both, but not either, imo.

[caugner]

Requesting a second opinion from @Elchi3.

[Elchi3]

LGTM what Chris did here.
We could also add it to ::marker but I have no strong opinion. The chromestatus also says that ::column will get it in the future, so I think always adding it to the selectors that gain support for it makes sense to me.

[Elchi3]

I think this is potentially a new web-feature. Let's keep the decision for web-feature maintainers and not add tags for now.

[chrisdavidmills]

I think this is potentially a new web-feature. Let's keep the decision for web-feature maintainers and not add tags for now.

Sounds good; cheers @Elchi3!