Lesson 3 of 3
Cross-Boundary Tracking: Recap And Verify
Advanced
Recap every lesson, then check your whole container in one pass.
Both lessons keep one session intact across a boundary: the linker passes GA4's identity to another domain in the URL, and the postMessage bridge passes an embedded widget's event up to the parent where GTM can see it.
Export your container and verify the module below.
What you covered
- Cross-Domain Linker: Cross-domain linking decorates outgoing links with _gl so the session continues.
- Iframe PostMessage Bridge: A postMessage relay turns an iframe's event into a parent dataLayer push.
Verify your whole container
Built everything in this module? Export your container (Admin → Export Container, choose your workspace) and drop the JSON here. We run every lesson's check against your single export, so you can confirm the whole module in one pass. It's checked in your browser, nothing is uploaded.
Drop your container .json here
or browse · checked in your browser, nothing is uploaded
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