VAST-4.2-icon-fallback-image-width-height
<IconClickFallbackImage> should have width and height attributes
WarningAmbiguousIAB VAST 4.2 §2.4.5VAST 4.2 and 4.3
`<IconClickFallbackImage>` (added in VAST 4.2) should carry `width` and `height` attributes so the player knows the dimensions of the fallback image before fetching it.
How to fix
Add width and height attributes to <IconClickFallbackImage> so the player knows the dimensions before fetching.
Check your VAST tag for
VAST-4.2-icon-fallback-image-width-height and other issues instantly.Validate a tag →Other Ambiguous rules
VAST-3.0-progress-offset<Tracking event="progress"> requires an offset attributeVAST-3.0-icon-attrsIcon missing recommended attributes (program/width/height/position)VAST-2.0-nonlinear-dimensions<NonLinear> missing width or heightVAST-2.0-companion-dimensions<Companion> missing width or heightVAST-4.0-wrapper-clickthrough<ClickThrough> inside Wrapper <VideoClicks> was removed in VAST 4.0 (re-allowed in 4.2)