Add confirm attribute on solid-form

source/import_documentation/Components/Solid-Form.rst

@@ -93,6 +93,12 @@ Attributes
    Add this attribute for the field ``xyz`` to precise extra information about an element.
    It works only with a ``solid-form-text`` widget.
 
+``confirmation-message``
+~~~~~~~~~~~~~~~~~~~~~~~~~
+   Add this attribute to create a dialog box linked with the submit button of the solid-form.
+   Its value matches the message displayed in the dialog box.
+
+
 Widgets
 -------
 By default, the widget used is ``<solid-form-label-text>``. Cf the