The AMP embed option provides completely valid AMP markup for forms on mobile pages. As with the Seamless and Iframe embed options, the AMP embed code is fully responsive to ensure that your form looks great on any device.
The Accelerated Mobile Pages Project (AMP) is an open-source initiative to improve the performance of web contents and ads through a publishing technology known as AMP. Essentially, AMP pages can load more quickly on mobile devices than your typical webpage.
Additionally, if you’re building AMP pages, this free amp validator is an easy way to check your pages and report any errors.
Some features (including redirect urls and form prefilling) will not work when embedding your form via the AMP option.
<script async custom-element="amp-iframe" src="https://cdn.ampproject.org/v0/amp-iframe-0.1.js"></script>
For more information about the amp-iframe, please refer to the AMP Project article.