Motivation

A4A (AMP Ads for AMPHTML Pages) is a mechanism for rendering fast, performant ads in AMP pages. To ensure that A4A ad documents ("A4A creatives") can be rendered quickly and smoothly in the browser and do not degrade user experience, A4A creatives must obey a set of validation rules. Similar in spirit to the AMP format rules, A4A creatives have access to a limited set of allowed tags, capabilities, and extensions.

This implementation will cover development of a specification for A4A creative format and validator rules enforcing that specification.

Proposed Design

A proposal for a format specification is being made on PR #4263. Community feedback is welcome either on that PR or this issue.

A set of validation rules, similar to existing AMP validation rules, will be developed based on the specification. The AMP validator will be extended to support A4A rules.