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IAB Standards Guardrails

Run smarter VAST audits that understand which version you are targeting and flag unsupported elements before ad servers reject your campaigns.

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How the version-aware guardrail works

Every audit now ships with a standards checklist that understands historical VAST releases.
  1. AdMeIn inspects the <VAST version="x.x"> attribute and fetches the XML produced by your audit.
  2. Each node and attribute is compared with our library of IAB schema changes across VAST 2.0–4.2.
  3. Unsupported items are flagged with the version where they became valid and a remediation note.
  4. You can open the dedicated IAB Standards page in your dashboard to explore the interactive tree and summaries.

Real-world failures we highlight

Unsupported nodes are surfaced with the version they belong to and remediation tips.
<AdVerification>
Introduced in VAST 4.0

This element is ignored when your ad declares version 3.0 or lower. Update the version or strip the node.

mezzanine bitrate > 30 Mbps
Introduced in VAST 4.1

Bitrate exceeds the IAB recommended maximum and may affect certain SSAI workflows.

OMID tracking event
Introduced in VAST 4.1

OMID events require VAST 4.1+ and a valid <AdVerifications> block.

Version coverage matrix

Know exactly which XML constructs are safe for each spec you target.
VAST 2.0
Coverage snapshot

What passes: Linear creatives, basic TrackingEvents, simple CompanionAds

What fails: AdVerifications, UniversalAdId, Mezzanine, OMID events

VAST 3.0
Coverage snapshot

What passes: Clickable icons, nonlinear companions, error tracking

What fails: Mezzanine, AdVerifications, AdServingId updates

VAST 4.0+
Coverage snapshot

What passes: Mezzanine hierarchy, mezz/stream bitrate rules, AdVerifications

What fails: Legacy companion required attributes, unsupported Flash MIME types

Built into your existing workflow

The IAB Standards view lives alongside the Summary, Structure, Wrapper Chain, and Tracking tabs.

Inspect the interactive tree to see which parent node introduced an unsupported element.

See what elements are failing and why without needing to cross-reference the IAB documentation or test in an ad server first.

Re-run `iab-standards` validation after edits with a single click to confirm the fix.

Key Features

  • Version-aware compliance for VAST 2.0 through 4.2
  • Highlights unsupported nodes and attributes with root-cause explanations
  • Side-by-side comparison of what each VAST spec allows vs. your XML
  • Companion summaries and interactive tree to inspect failures quickly
  • One-click revalidation after editing your XML

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