This page tests amp-inabox. Follow the instructions and check points.
Inabox above the fold
Check Point 1: Above the fold visibility tracking
Before any scrolling, you should see 3 failed network requests:
img2Visible. Also check their URL params.
Inabox below the fold, and nested in friendly iframe
Now scroll slowly...
Check Point 2: Below the fold visibility tracking
You should have seen another 2 failed network requests:
rootVisible when the 2nd iframe enters viewport.
Then followed by
img2Visible when the 2nd image in this iframe enters viewport.
Check Point 3: AMP elements rendering for inabox
This is a long AMP document. You should see everything renders correctly. All check console errors.