Frank, are you using an Oxygen framework for your custom CSS? Best, Kris Kristen James Eberlein Chair, OASIS DITA Technical Committee Owner, Eberlein Consulting LLC kris@eberleinconsulting.com Skype: kriseberlein; voice: +1 (919) 622-1501 From: oXygen-user <oxygen-user-bounces@oxygenxml.com> On Behalf Of Frank Dissinger Sent: Wednesday, January 18, 2023 4:31 AM To: Oxygen User Mailing List <oxygen-user@oxygenxml.com> Subject: [oXygen-user] CSS validation warnings Hi list, I keep getting the following CSS validation errors for my "custom.css" file in oXygen V25: * Unknown pseudo-element or pseudo-class “:no-tags” * Negative values are not allowed: -0.5em (padding) * Property “margin-inline-start” doesn't exist : 0 This is annoying because the "Results" window keeps popping up whenever I save a dita file. How can I tell oXygen to ignore these elements/properties/values? I can't find the required settings under "Options > Preferences > CSS Validator". Frank -- Frank Dissinger Documentation Manager .................................................................... CGS Publishing Technologies International GmbH Email frank.dissinger@cgs-oris.com<mailto:frank.dissinger@cgs-oris.com> | Web www.cgs-oris.com<http://www.cgs-oris.com/> Address Kettelerstr. 24 | D-63512 Hainburg | Germany Phone +49 6182 9626-27 | Fax +49 6182 9626-99 Commercial register Offenbach, HRB no. 21495 Managing directors Bernd Rückert, Christoph Thommessen [https://www.cgs-oris.com/Signatur.png]<https://www.cgs-oris.com/signatur>