Tank you @solideogloria.
You are correct. The webform_entity_print.css is not showing any marker.
Y tried all your suggestions, deleted composer.lock file and run composer update --with-all-dependencies , deleting the css file, and reinstalled the webform module without success. After i updated the module from 6.1 to 6.2 i run updates and deleted cache. Still having the same error.
- Removing drupal/webform (6.2.0-beta6)
Deleting modules/contrib/webform - deleted
- Downloading drupal/webform (6.2.0-beta6)
- Installing drupal/webform (6.2.0-beta6): Extracting archive
Just installed webform 6.2.0-beta6 and he error is still there. Error generating document: Failed to generate PDF: The CSS selector 'summary::-webkit-details-marker' is not valid. Does this mean i need patch 2?
Best regards