VAST-4.0-conditionalad
VAST-4.0-conditionalad
conditionalAd attribute is deprecated as of VAST 4.1
WarningDeprecatedIAB VAST 4.1 §2.2VAST 4.0, 4.1, 4.2, and 4.3
Short answer
The conditionalAd attribute on <Ad> was deprecated in VAST 4.1. Players may ignore it. Remove it or migrate to the recommended approach in the 4.1 spec.
Why this matters in production
This rule is a strong risk signal. Tags with this issue often still parse, but they become brittle across SDKs, SSAI resolvers, and CTV environments. Deprecated features are a long-tail compatibility problem: they may appear to work in one legacy stack and fail silently in newer players, SSAI chains, or device ecosystems. Affected scope: VAST 4.0, 4.1, 4.2, and 4.3.
How to fix
Remove the conditionalAd attribute from <Ad>.
Check your VAST tag for
VAST-4.0-conditionalad and other issues instantly.Validate a tag →Other Deprecated rules
VAST-4.1-survey-deprecated<Survey> is deprecated as of VAST 4.1VAST-4.1-vpaid-apiframeworkapiFramework="VPAID" is deprecated as of VAST 4.1VAST-4.0-mediafile-apiframework<MediaFile apiFramework> is deprecated in VAST 4.0+ — use <InteractiveCreativeFile>VAST-2.0-flash-mediafileFlash-based MediaFile type is no longer supported