container audit

GTM-NQJ3RGB

This container ships 68 hand-written scripts (32 KB of JavaScript) to every visitor — more than 96% of the 46,522 containers we have measured. That is an application's worth of code, delivered as tag configuration.

Measurement runs through a server container on its own domain — the mark of a mature setup, and rarer than the tooling vendors imply.
355 published versions — each one live for every visitor the moment it was published.
inner-html is uncommon — under 6% of the containers we have measured have it. That is context rather than a verdict: a server container is rarer still and is a sign of a mature setup. What it means is in the finding itself.

Tags491

Custom scripts68

Third parties20

Delivered813 KB

Versions355

What we observed

A real browser loaded heineken.com a month ago and recorded every request it made. This is what happened, as distinct from what the container is configured to do. It is one page load — anything that fires only deeper in the site did not fire here.

Container loaded from www.heineken.com — the site's own host, at /hei-sst/gtm.js rather than the default path, and googletagmanager.com

Measurement sent to www.heineken.com — not Google, at /hei-sst/g/collect

Measurement runs through the site's own infrastructure. Part of the tag library still comes from Google, which is normal — the two are loaded separately.

Forwarded to GA4 ×6 — read from the measurement id, not the hostname

Consent OneTrust answered its own API. Measurement fired beforehand but carried no identifier — analytics_storage was denied, which is Consent Mode working as designed rather than a gap. no new hosts appeared after granting — either the tags are ungated, or they fire regardless and record the decision. Google recorded gcs=G100 (all denied).

Third parties contacted 17 hosts — fonts.googleapis.com, cdn.cookielaw.org, js.monitor.azure.com, www.googletagmanager.com, geolocation.onetrust.com, pagead2.googlesyndication.com, www.google-analytics.com, westeurope-5.in.applicationinsights.azure.com, and 9 more

dataLayer events seen gtm.js, OneTrustLoaded, OptanonLoaded, gtm.dom, gtm.load, page_view, gtm.click

Where the data goes

Confirmed — a browser watched this site send measurement data to www.heineken.com, not to Google. observed on heineken.com More info »

Findings

Ordered by consequence. review has a concrete cost when it bites; info is real but depends on your setup. Seen is how common it is across the containers we have measured — reported separately on purpose, because common and harmless are different claims.

reviewdocument.write (12)

12 pieces of custom code call document.write.

Whydocument.write blocks the HTML parser while it runs, and browsers ignore it entirely once the page has finished parsing — so an async-loaded tag using it can silently do nothing.

CheckIf these tags fire on page load they are costing render time; if they fire later they may not be working at all. Worth confirming the tag still does what it was added to do.

Seenseen in 18.4% of 46,522 containers measured

reviewHardcoded http:// URL (1)

1 piece of custom code reference a plain http:// address.

WhyOn an https:// page the browser blocks or upgrades these. Blocked means the tag quietly stops working; upgraded only works if that host also serves https.

CheckCheck whether the hosts below still respond over https, and update the URLs.

Seenseen in 12.8% of 46,522 containers measured

reviewWrites innerHTML (1)

1 piece of custom code assign to innerHTML.

WhyAssigning innerHTML parses the string as HTML. If any of it comes from the URL, the page or a cookie, that is a script-injection route into your own site.

CheckCheck whether the assigned value is a fixed template or built from something a visitor can influence.

Seenseen in 5.7% of 46,522 containers measured

infoOne variable that a great deal depends on (147)

"user.age_group" is read by 147 tags and triggers — more than anything else in this container.

WhyGTM shows you where a variable is defined, never how much depends on it. Editing this one touches a large share of the container at once, and whatever breaks will surface somewhere that looks unrelated to the change.

CheckBefore changing it, check what reads it. If it feeds both measurement and consent or routing logic, split those uses apart first.

Seenseen in 10.1% of 46,522 containers measured

infoLoads JavaScript from another host (17)

17 pieces of custom code fetch and run JavaScript from another host.

WhyWhatever that host serves executes with full access to the page — it can read the DOM, cookies and form fields. The code is not in this container, so it can change at any time without any change here.

CheckConfirm you recognise every host below and that someone owns the relationship. A host you cannot name is the one to chase.

Seenseen in 54.4% of 46,522 containers measured

infoVendor IDs written into custom code (3)

3 vendor IDs are pasted directly into custom HTML rather than held in a variable or template.

WhyChanging a property, pixel or account then means editing every tag that mentions it, and any one that gets missed keeps sending to the old destination indefinitely.

CheckFine if the ID never changes. If you have ever migrated a property, check that none of these still point at the old one.

Seenseen in 31.4% of 46,522 containers measured

infoConsent configuration detected (2)

The container declares one or more consent signals.

WhyConsent handling is present in the container. This describes what the artifact declares; what actually happened on the page is measured separately, above.

CheckConfirm these settings match the consent policy you intend to enforce, and compare them with the before-and-after observation.

Seenseen in 44.6% of 46,522 containers measured

Third parties it can reach

Each host is a party that can execute code or receive data in a visitor's browser. Follow one to see who else loads it. More info »

What the custom templates can do

Custom templates are third-party code shipped inside the container. Injecting scripts and running page globals is ordinary for them — most tag templates need it to work — so this is an inventory, not a warning. It lists the capability each template declares so you can match it against templates you meant to install.

__cvt_K8GSG gallery runs page-level globals

__cvt_97967822_240 private injects code from connect.facebook.net · runs page-level globals

__cvt_K4VXG gallery injects code from sc-static.net, tr.snapchat.com · runs page-level globals

__cvt_MRQN8 gallery runs page-level globals

__cvt_PBGZL gallery injects code from www.redditstatic.com · runs page-level globals

Detected on

Sites observed loading this container. A container used across many hosts is a shared template; one on a single host is a bespoke build. Follow a site to see every container it loads.

heineken.com

What this audit describes

Containers change. These findings describe one specific artifact, and you can re-fetch it to check this reading.

Container	`GTM-NQJ3RGB`
Published version	`355` — the identity of this configuration. It changes only when someone publishes.
Read at	2026-08-12 22:39:28 UTC (a month ago)
Source	`https://www.googletagmanager.com/gtm.js?id=GTM-NQJ3RGB`
Body checksum	`1a92232c43998f823f4c75c1fd367650df3e526401365d15fbaedf96ef2e5589` Evidence of the exact bytes we read, not an identity: Google varies the response per request, so re-fetching an unchanged container yields a different checksum. Compare the published version instead.

Re-audit

This reading is from a month ago. A container can be republished at any time, and nothing here updates on its own — a fresh read is the only way to know whether it still says this. Running it again replaces this page in place, so the link keeps working.

Re-audit GTM-NQJ3RGB

Check another container

Put this container under version control. Tagora exports it to a repository you own, so every change arrives as a pull request. How it works »