AMP: Accelerated Mobile Pages / AMP Page Validation
Invalid AMP pages are useless. Please validate your pages as thoroughly as possible. Our goal is to get the search engines to eat up our AMP pages the first time around.
The validation tool at the link above is easy to use and has descriptive explanations of any problems. I find it to be a great tool.
There are also Chrome browser plugins for AMP pages. I've been happy with AMP Validator.
