Because d means hidden... in another parallel universe

Yeah it's stupid, but d === display

If d stands for display then hidden === d make no freaking sense, but that’s ok because bootstrap doesn’t make any sense anymore ?

Well it does make sense cause before you had to use hidden- or visible-, and now it's just d-, so the approach is better. It also couples nicely with the flex utilities

The fact it's d- instead of display- is odd but meh.

Well for a BEM fan bootscrap will never make any sense. Anyways this needs to be done

d stands for display utilities and when you look at the totality of what the new display utility classes do then it makes sense https://getbootstrap.com/docs/4.0/utilities/display/

Would not this be not B/C?
I tested some 3.8. components using radio fields and I found out that all such fields needed the class to be changed to

type="radio"
class="switcher"

because otherwise, they just would not work at all.

I understand many aspects will not be B/C in 4.0, but have'nt we been told that an extension working fine in 3.9 will be OK for 4.0 ?

This is a genuine question, not a rant.

@infograf768 - I'm referring to hidden-*-*, not hidden-*

The later was deprecated in BS 2.3 if I rightly remember. BS4 moved to the new display utilities in beta-1 and seeing as J4 is in alpha, it's fine.

Side note, this has nothing to do with the switcher. The switcher class is optional on fields, not required

Side note, this has nothing to do with the switcher. The switcher class is optional on fields, not required

I understand this has nothing to do with the switcher. But when you have though a class class="btn-group btn-group-yesno" in 3.9, it will not work in 4.0.

Please open a new issue.

You may have a valid point, but I do not want to have to look through unrelated issues in the future, for the topic I need to search for

Sure.

#19113

PR created #19332

Set to "closed" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/19088

closed as having Pull Request #19332