Methods and systems for selectively preventing third-party content from being displayed using undefined publisher identifier

Abstract

Systems and methods of selectively preventing content slots from displaying content items on an information resource are described. Processors receive a request to provide, to a computing device, an electronic document corresponding to an information resource having content slots in which content items are displayed. The processors determine, in response to the request, to provide a modified version of the electronic document including actionable language that prevents at least one of the content slots from displaying content items. The processors identify in the electronic document, the at least one content slot to prevent from displaying content items. The processors modify the electronic document to include a snippet of actionable language in a portion of the electronic document that is executed by the computing device prior to executing actionable language corresponding to the identified at least one content slot. The processors transmit the modified electronic document to the computing device.