VAST-3.0-skip-event-no-skipoffset
VAST-3.0-skip-event-no-skipoffset
skip tracking event present but Linear has no skipoffset attribute
WarningValuesIAB VAST 3.0 §2.4.1VAST 3.0, 4.0, 4.1, 4.2, and 4.3
Short answer
If you track the skip event you must also set skipoffset on <Linear> to tell the player when the skip button appears. Without skipoffset, the skip event will never fire.
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. Value-format rules tend to fail at the moment a player interprets a field such as duration, skipoffset, bitrate, or versioning. They are especially painful because the XML can look valid at a glance. Affected scope: VAST 3.0, 4.0, 4.1, 4.2, and 4.3.
How to fix
Add skipoffset="HH:MM:SS" to <Linear> to define when the skip button should appear.
Check your VAST tag for
VAST-3.0-skip-event-no-skipoffset and other issues instantly.Open the VAST tag validator →Other Values rules
VAST-4.1-expires-integer<Expires> value must be an integer number of secondsVAST-4.0-category-authority-not-uri<Category> authority attribute is not a valid authority URLVAST-4.0-category-authority-unknown<Category> authority is not a recognised IAB Content Taxonomy authorityVAST-4.1-blockedadcategories-authority-not-uri<BlockedAdCategories> authority attribute is not a valid authority URLVAST-4.1-blockedadcategories-authority-unknown<BlockedAdCategories> authority is not a recognised IAB Content Taxonomy authorityVAST-4.1-verification-vendor-format<Verification> vendor should use a domain-qualified identifier such as company.com-omidVAST-4.1-verification-tracking-reasonverificationNotExecuted tracking URI should include the [REASON] macroVAST-2.0-duration-format<Duration> value does not match HH:MM:SS[.mmm] format