What was accomplished

• AMP actions validator rules now available.
• Correct handling of document fragments in the cache. #19688
• Transformed AMP SXG now include
  • version of transformers used
  • original CSS string fragments
  • protect against data:...</style> in CSS
  • css escaping logic
• Validation of transformer cdn and version

What's next

• Transformed AMP SXG to
  • strip comments from script tags
• Validator to enable/disable tagspec based on type identifiers.