https://developer.apple.com/library/content/documentation/General/Conceptual/ExtensibilityPG/ContentBlocker.html https://developer.apple.com/library/content/doc

https://developer.apple.com/library/content/documentation/General/Conceptual/ExtensibilityPG/ContentBlocker.html https://developer.apple.com/library/content/documentation/Ge... It is not system-wide, but does extend to Safari View Controllers. I never encountered an ad on my iPhone since I installed a Safari ad blocker (I don't use any ad-supported free games/applications).