VAST-4.0-tracking-event-removed
fullscreen/exitFullscreen tracking events were removed in VAST 4.0
Short answer
The fullscreen and exitFullscreen tracking event values were removed in VAST 4.0. Players conforming to 4.0+ will not fire these events. Use playerExpand / playerCollapse instead.
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 4.0, 4.1, 4.2, and 4.3.
How to fix
Replace fullscreen with playerExpand and exitFullscreen with playerCollapse for VAST 4.0+ compatibility.
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