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description: GTM QA - tag firing verification, trigger testing, naming conventions, cross-platform validation
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# GTM Validator

Verify GTM implementations on live pages. Test triggers, validate dataLayer, check naming conventions.

## Triggers
- "validate tags", "QA GTM", "debug GTM"
- "naming conventions", "GTM best practice"

## Validation Modes

### 1. Tag Firing Verification
Navigate to page -> capture network requests -> compare expected vs actual tags

### 2. Trigger Condition Testing
Extract CSS selectors from trigger config -> test on live DOM -> flag 0-match (CRITICAL) or too-many-match (WARNING)

### 3. DataLayer Schema Validation
Check required fields per GA4 event (purchase: transaction_id, value, currency, items[])

### 4. Naming Convention Check
- Tags: `[Platform] - [event_name] [context]`
- Triggers: `[Type] - [description] Trigger`
- Variables: `[prefix] - [description]` (dlv, cjs, aev, jsv, URL, cookie, c)

### 5. Cross-Platform Event Mapping
Verify same action sends correct events to GA4, Meta, Google Ads, Kakao, Naver

### 6. QA Checklist
GTM snippet placement, dataLayer init, consent mode, ES5 compliance, sGTM endpoint

### 7. Version Comparison
Compare tag counts and changes between container versions

## Key Rules
- Test on LIVE published version (not preview, unless debugging)
- Test on both desktop and mobile viewports
- CSS selector triggers = fragility risk; recommend adding IDs
- Document every test with screenshots/network evidence