[FEATURE] "Floating Labels" option

[pascalmoser]

Q	A
Bug report?	no
Feature request?	yes
BC Break report?	no
RFC?	yes

Floating labels in forms are gaining popularity. There are some ways to do this without JS. For a CSS only solution some rules are necessary:

• The Label should be after the Input Field
• The input field should have a placeholder attribute
• Makes only sense with the following fields: Text, Number, Textarea, Select? (Bootstrap 5)

CSS Solutions

• Tailwind 2.2
• Bootstrap 5

Implemented Conditions

• Condition in Symfony Bootstrap 5 Form Layout
• Condition in Formbuilder Tailwind 2 Form Layout #314

Symfony Docs for the Bootstrap 5 Way

Do we need to provide other options like in the Symfony Bootstrap 5 Form Theme documentation (input-group, checkbox-switch, checkbox-inline)?