What is gtm_cookies_win in GTM?

If you have started using the “environments” feature in Google Tag Manager (if not, read why you should at Simo Ahava’s blogpost on environments), then maybe you’ve experienced some weird/confusing behaviour when using the preview/debug functions.

You may have also noticed the gtm_cookies_win=x in your tracking snippet.

Tracking snippet from the “Staging” environment.

After searching for information about the gtm_cookies_win parameter, and not finding anything, I decided to try and debug my way out of it.

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