API page: https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Render%21...
Enter a descriptive title (above) relating to abstract class FormElement, then describe the problem you have found:
I noticed that the #prefix and #suffix properties are not included in the documentation.
It could be something like:
- #prefix: (string) Prefix to display before the form element. Should be translated, normally. If it is not already wrapped in a safe markup object, will be filtered for XSS safety.
- #field: (string) Suffix to display after the form element. Should be translated, normally. If it is not already wrapped in a safe markup object, will be filtered for XSS safety.