How do I make a field suitable for auto-fill?

Form fields can be made suitable to be filled in automatically by the browser (autocomplete function).
To know which value is suitable for a field, the browser needs to know what the purpose of the field is.
Because this purpose cannot always be derived from the name of the field, a special technique is available with fixed naming.

For example: the Email field must have an attribute

autocomplete="email"

All text fields can be customized according to the purpose of the field.
These can be set via the "Advanced" button, which can be found on the form settings.
Key must be filled with the text "autocomplete".
And the value with the correct attribute.

This topic is a success criterion of the WCAG (1.3.5)