vastlint

VAST-4.1-blockedadcategories-no-authority

<BlockedAdCategories> should have authority attribute

WarningRequired fieldsIAB VAST 4.1 §2.3VAST 4.1, 4.2, and 4.3

`<BlockedAdCategories>` should include an `authority` attribute that identifies the taxonomy in use, just like `<Category>` in 4.0+.

How to fix

Add authority="https://iabtechlab.com/IAB_Tech_Lab_Content_Taxonomy" to <BlockedAdCategories>.

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