VAST-4.1-companion-renderingmode-value
Companion renderingMode must be default, end-card, or concurrent
WarningValuesIAB VAST 4.1 §2.4.2VAST 4.1, 4.2, and 4.3
The `renderingMode` attribute on `<Companion>` (VAST 4.1+) must be `default`, `end-card`, or `concurrent`. Other values are not defined.
How to fix
Set renderingMode on <Companion> to default, end-card, or concurrent.
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