TYPO3 Core

Set up a fresh TYPO3 v9.2.1, install form extension and fluid-styled-content. Use example configuration.

Add a form element on Startpage, assign a form with confirmation finisher like:

renderingOptions:
  submitButtonLabel: Submit
type: Form
identifier: test
label: test
prototypeName: standard
finishers:
  -
    options:
      message: test123
      contentElementUid: ''
    identifier: Confirmation
renderables:
  -
    renderingOptions:
      previousButtonLabel: 'Previous step'
      nextButtonLabel: 'Next step'
    type: Page
    identifier: page-1
    label: Step
    renderables:
      -
        defaultValue: ''
        type: Text
        identifier: text-1
        label: Text

If you submit the form, the confirmation message "test123" is rendered as "test123 test123".